strace Java 小程序

发布于 2024-07-27 22:12:59 字数 976 浏览 3 评论 0原文

我正在尝试 strace java 小程序，但 strace 似乎不起作用。我正在调用以下函数。

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);
    }
}

在调用上面的消息之前，我从 strace 得到以下输出，然后从 strace 没有得到任何结果：

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

一旦我开始从该方法获取日志输出，我就从 strace 得不到更多信息。我对 strace 还很陌生。关于发生什么事的任何线索吗？小程序可以追踪吗？

原文

I'm trying to strace a java applet, and strace doesn't seem to be working. I'm calling the following function.

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);
    }
}

I get the following output from strace just before the above message is called and then nothing from strace:

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

Once I start getting log output from the method, I get nothing more from strace. I'm pretty new to strace. Any clues on what is going on? Can applets be straced?

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箜明 2024-08-03 22:12:59

您可能只跟踪单个线程。
使用 -f 标志运行 strace。

回复收藏 0 原文

想你只要分分秒秒 2024-08-03 22:12:59

为手册页欢呼三声，我想要跟随叉子标志，-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

现在我得到了：

[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

Three cheers for man pages, I want the follow forks flag, -f and -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

now I get:

[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

回复收藏 0 原文

~没有更多了~