2009-07-27 64 views
1

我试图strace一个Java小程序,strace似乎并没有工作。我正在调用以下函数。strace java小程序

public static void testSTrace(){ 
    long c = 0; 
    for (int i = 0; i < 1000; i++){ 
     long start = System.nanoTime(); 

     try{Thread.sleep(0, 100);}catch(Exception e){/*cry*/} 

     long stop = System.nanoTime(); 

     log.info("start : " +start+" stop : "+stop); 
    } 
} 

我得到以下从strace的输出称为上述消息之前再没有什么从strace的:

clone(child_stack=0xb7c9f4c4, 
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM| 
CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, 
parent_tidptr=0xb7c9fbf8, {entry_number:6, base_addr:0xb7c9fbb0, 
limit:1048575, seg_32bit:1, 
contents:0, read_exec_only:0, 
limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xb7c9fbf8) = 8351 futex(0xb7c9fbf8, FUTEX_WAIT, 8351, NULL 

一旦我开始越来越从方法日志输出,我从strace的仅此而已。我非常喜欢strace。任何有关正在发生的事情的线索?小程序可以被整理吗?手册页

回答

1

你可能只strace'ing单线。 用-f标志运行strace。

+1

是的,我发现在发布我的问题后30秒=) – 2009-07-27 13:14:06

0

欢呼三声,我想后续叉标志,-f和-F

-f -- follow forks, -ff -- with output into separate files 
-F -- attempt to follow vforks, -h -- print help message 

strace -fF /bin/appletviewer test.html 

现在我得到:

[pid 8401] gettimeofday({1248700317, 550296}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 550401}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 550500}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 550626}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 550883}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 550993}, NULL) = 0 
[pid 8401] gettimeofday({1248700317, 551093}, NULL) = 0