c艸這開發(fā)效率，小心肝真得受不了

lxyscls

操作個數(shù)據(jù)庫，生怕哪里漏了，又生怕哪里踩了c艸11的語法也是把整個工程例子都搜了個遍，才看懂怎么用

這開發(fā)效率，也就只能它哥能“比”了

ouyixq

If you want to change something, start with baby steps. Take a small action - any action - and grow from there.

cokeboL

啥項目，可以換golang不

sxcong

這個和語言沒關(guān)系。比如通常Java訪問數(shù)據(jù)庫比較友好，但不讓你用JDBC等引擎，還不如C++。不知道你用的是哪種數(shù)據(jù)庫，一般MS的自己有ODBC和ADO，Mysql和Oracle都有開源引擎。從頭寫你用什么語言都一樣，連接池，并發(fā)處理，異常處理，事務(wù)操作...沒一個省心的。

windoze

回復(fù) 4# sxcong

拋開效率不談，用Java從頭寫一個DB client還是比C++略高，畢竟有GC寫起程序來還是省事不少

zylthinking

windoze 發(fā)表于 2017-12-06 12:29
回復(fù) 4# sxcong

拋開效率不談，用Java從頭寫一個DB client還是比C++略高，畢竟有GC寫起程序來還是省事 ...

剛遇到一個問題， tomcat 死活不反應(yīng)了， 看 top cpu 貌似一會兒 90+%， 一會兒降下去； 查看日志， 有記錄說是內(nèi)存爆了;
用 jstack, 輸出如下：

Deadlock Detection:

No deadlocks found.

Thread 2666: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=135 (Compiled frame)
- java.lang.ref.ReferenceQueue.remove() @bci=2, line=151 (Compiled frame)
- org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$ReferenceQueueThread.run() @bci=10, line=1122 (Interpreted frame)


Thread 31824: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31641: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31640: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31442: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31415: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31414: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31322: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31321: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31255: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31163: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31162: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31161: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31160: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31159: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31060: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31033: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31032: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=135 (Compiled frame)
- java.lang.ref.ReferenceQueue.remove() @bci=2, line=151 (Compiled frame)
- sun.java2d.Disposer.run() @bci=3, line=145 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31031: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31030: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Interpreted frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31029: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31028: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31014: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=186 (Compiled frame)
- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2043 (Compiled frame)
- java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=36, line=104 (Compiled frame)
- org.apache.tomcat.util.threads.TaskQueue.take() @bci=1, line=32 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.getTask() @bci=156, line=1068 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1130 (Compiled frame)
- java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
- org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() @bci=4, line=61 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31012: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
- java.net.AbstractPlainSocketImpl.accept(java.net.SocketImpl) @bci=7, line=398 (Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=530 (Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=498 (Interpreted frame)
- org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(java.net.ServerSocket) @bci=1, line=60 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run() @bci=95, line=220 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31011: (state = IN_NATIVE)
- sun.nio.ch.ServerSocketChannelImpl.accept0(java.io.FileDescriptor, java.io.FileDescriptor, java.net.InetSocketAddress[]) @bci=0 (Interpreted frame)
- sun.nio.ch.ServerSocketChannelImpl.accept() @bci=130, line=241 (Interpreted frame)
- org.apache.tomcat.util.net.NioEndpoint$Acceptor.run() @bci=88, line=809 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31010: (state = IN_NATIVE)
- sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int) @bci=0 (Compiled frame; information may be imprecise)
- sun.nio.ch.EPollArrayWrapper.poll(long) @bci=18, line=269 (Compiled frame)
- sun.nio.ch.EPollSelectorImpl.doSelect(long) @bci=28, line=79 (Compiled frame)
- sun.nio.ch.SelectorImpl.lockAndDoSelect(long) @bci=37, line=87 (Compiled frame)
- sun.nio.ch.SelectorImpl.select(long) @bci=30, line=98 (Compiled frame)
- org.apache.tomcat.util.net.NioEndpoint$Poller.run() @bci=134, line=1179 (Compiled frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 31009: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
- org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run() @bci=46, line=1513 (Compiled frame)
- java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)


Thread 30981: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30980: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30979: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30978: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30977: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30976: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30975: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30974: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30973: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30972: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=44, line=523 (Compiled frame)


Thread 30813: (state = IN_NATIVE)
- sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int) @bci=0 (Compiled frame; information may be imprecise)
- sun.nio.ch.EPollArrayWrapper.poll(long) @bci=18, line=269 (Compiled frame)
- sun.nio.ch.EPollSelectorImpl.doSelect(long) @bci=28, line=79 (Compiled frame)
- sun.nio.ch.SelectorImpl.lockAndDoSelect(long) @bci=37, line=87 (Compiled frame)
- sun.nio.ch.SelectorImpl.select(long) @bci=30, line=98 (Compiled frame)
- org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run() @bci=52, line=339 (Compiled frame)


Thread 30812: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- sun.misc.GC$Daemon.run() @bci=51, line=117 (Interpreted frame)


Thread 30777: (state = BLOCKED)


Thread 30776: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=135 (Compiled frame)
- java.lang.ref.ReferenceQueue.remove() @bci=2, line=151 (Compiled frame)
- java.lang.ref.Finalizer$FinalizerThread.run() @bci=36, line=209 (Compiled frame)


Thread 30769: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
- java.lang.Object.wait() @bci=2, line=503 (Compiled frame)
- java.lang.ref.Reference$ReferenceHandler.run() @bci=46, line=133 (Compiled frame)


Thread 30762: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
- java.net.AbstractPlainSocketImpl.accept(java.net.SocketImpl) @bci=7, line=398 (Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=530 (Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=498 (Interpreted frame)
- org.apache.catalina.core.StandardServer.await() @bci=180, line=453 (Interpreted frame)
- org.apache.catalina.startup.Catalina.await() @bci=4, line=777 (Interpreted frame)
- org.apache.catalina.startup.Catalina.start() @bci=209, line=723 (Interpreted frame)
- sun.reflect.NativeMethodAccessorImpl.invoke0(java.lang.reflect.Method, java.lang.Object, java.lang.Object[]) @bci=0 (Interpreted frame)
- sun.reflect.NativeMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=87, line=57 (Interpreted frame)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=43 (Interpreted frame)
- java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=57, line=606 (Interpreted frame)
- org.apache.catalina.startup.Bootstrap.start() @bci=37, line=321 (Interpreted frame)
- org.apache.catalina.startup.Bootstrap.main(java.lang.String[]) @bci=150, line=455 (Interpreted frame)



誰能告訴我這是怎么回事， 號稱的 GC 呢？

windoze

Thread 31010: (state = IN_NATIVE)
- sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int) @bci=0 (Compiled frame; information may be imprecise)

In native，哈哈哈哈GC也救不了你了。

ouyixq

The world is so big, not everyone can get the results you want.

ouyixq

zylthinking 發(fā)表于 2017-12-06 13:45
剛遇到一個問題， tomcat 死活不反應(yīng)了， 看 top cpu 貌似一會兒 90+%， 一會兒降下去； 查看日志， 有 ...

說是頁面鎖死了

zylthinking

回復(fù) 7# windoze

epoll 當(dāng)然是 innative, 但問題不是 epoll 出問題了， 就是內(nèi)存爆了
看看里面的線程棧， 都是tomcat 自己的吧， 沒有任何一個線程滯留在服務(wù)函數(shù)里面
你說一個 java 的服務(wù)程序， 入口就是一個函數(shù)， 不在函數(shù)里面， 不管申請了什么資源， 總歸都是被各種臨時變量引用著吧， 為什么它出了函數(shù)， 就是無法釋放？


這叫什么事