• End-to-End Tracing of Ajax/Java Applications Using DTrace


    End-to-End Tracing of Ajax/Java Applications Using DTrace

    Category: Utility

    We posted about using DTrace to profile Firefox in the past, and

    today Amit Hurvitz published a piece on Ajax, DTrace and Where They Meet.

     
    JAVASCRIPT
     
    1. #!/usr/sbin/dtrace -Zs
    2.  
    3. #pragma D option quiet
    4. #pragma D option switchrate=10
    5.  
    6. dtrace:::BEGIN
    7. {
    8.         jsIndent = 0;
    9.         jsFile = "ajax-validation";
    10.         javaMethodBoundary= "doGet";
    11.         startTimestamp = timestamp;
    12. }
    13.  
    14. *mozilla$1:::js_function-entry
    15. /basename(copyinstr(arg0)) == jsFile/
    16. {
    17.         jsIndent += 2;
    18.         printf("%*s -> %s:%s (JavaScript)(elapsed ms: %d) ", jsIndent, "",
    19.             jsFile, copyinstr(arg2), (timestamp - startTimestamp) / 1000);
    20. }
    21.  
    22. *mozilla$1:::js_function-return
    23. /basename(copyinstr(arg0)) == jsFile/
    24. {
    25.         printf("%*s < - %s:%s (JavaScript)(elapsed ms: %d) ", jsIndent, "",
    26.             jsFile, copyinstr(arg2), (timestamp - startTimestamp) / 1000);
    27.         jsIndent -= 2;
    28. }
    29.  
    30.  
    31. hotspot$2:::method-entry
    32. {
    33.         self->strPtr = (char *)copyin(arg1, args[2]+1);
    34.         self->strPtr[(int)args[2]] = '';
    35.         self->classStr = (string)self->strPtr;
    36.         self->strPtr = (char *)copyin(arg3, (int)args[4]+1);
    37.         self->strPtr[(int)args[4]] = '';
    38.         self->methodStr = (string)self->strPtr;
    39. }
    40.  
    41. hotspot$2:::method-entry
    42. /javaMethodBoundary == self->methodStr/
    43. {
    44.         self->interested = 1;
    45.         self->indent = 0;
    46. }
    47.  
    48. hotspot$2:::method-entry
    49. /self->interested/
    50. {
    51.         self->indent += 2;
    52.         printf("%*s -> %s:%s (Java)(elapsed ms: %d) ", self->indent, "",
    53.             self->classStr, self->methodStr, (timestamp - startTimestamp) / 1000);
    54. }
    55.  
    56. hotspot$2:::method-return
    57. {
    58.         self->strPtr = (char *)copyin(arg1, args[2]+1);
    59.         self->strPtr[(int)args[2]] = '';
    60.         self->classStr = (string)self->strPtr;
    61.         self->strPtr = (char *)copyin(arg3, (int)args[4]+1);
    62.         self->strPtr[(int)args[4]] = '';
    63.         self->methodStr = (string)self->strPtr;
    64. }
    65.  
    66. hotspot$2:::method-return
    67. /self->interested/
    68. {
    69.         printf("%*s < - %s:%s (Java)(elapsed ms: %d) ", self->indent, "",
    70.             self->classStr, self->methodStr, (timestamp - startTimestamp) / 1000);
    71.         self->indent -= 2;
    72. }
    73.  
    74. hotspot$2:::method-return
    75. /javaMethodBoundary == self->methodStr/
    76. {
    77.         self->interested = 0;
    78.         /* exit(0); */
    79. }

    It then continues to show timings of methods and such. This may not be the simplest solution for debugging, but at least you can get inside the black box when you need too.

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  • 原文地址:https://www.cnblogs.com/zengkefu/p/7502498.html
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