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| author | gnn <gnn@FreeBSD.org> | 2012-05-12 20:38:18 +0000 |
|---|---|---|
| committer | gnn <gnn@FreeBSD.org> | 2012-05-12 20:38:18 +0000 |
| commit | 4297c1b2d07fec7f50b70e26e3adb4d062b19e15 (patch) | |
| tree | aec2772e8855e6dbaea6d8136ed0c47bcb825dee /Examples/pl_malloc_example.txt | |
| parent | 111c75a23278cd9317f0a13867c22ee0f6c95b26 (diff) | |
| download | FreeBSD-src-4297c1b2d07fec7f50b70e26e3adb4d062b19e15.zip FreeBSD-src-4297c1b2d07fec7f50b70e26e3adb4d062b19e15.tar.gz | |
Add the remaining scripts from the DTraceToolkit, version 0.99, to the
vendor tree.
http://www.brendangregg.com/dtrace.html#DTraceToolkit
Diffstat (limited to 'Examples/pl_malloc_example.txt')
| -rw-r--r-- | Examples/pl_malloc_example.txt | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Examples/pl_malloc_example.txt b/Examples/pl_malloc_example.txt new file mode 100644 index 0000000..a22a008 --- /dev/null +++ b/Examples/pl_malloc_example.txt @@ -0,0 +1,79 @@ +The following are examples of pl_malloc.d. + +This is an expiremental script that attepmts to identify who is calling +malloc() from Perl, and to print byte distribution plots. + +Here it traces the example program, Code/Perl/func_malloc.pl. + +# pl_malloc.d -c ./func_malloc.pl +Function A +Function B +Function C +Tracing... Hit Ctrl-C to end. + +Perl malloc byte distributions by engine caller, + + perl`perl_alloc, total bytes = 1 + value ------------- Distribution ------------- count + 0 | 0 + 1 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 2 | 0 + + libc.so.1`_findbuf, total bytes = 520 + value ------------- Distribution ------------- count + 256 | 0 + 512 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 1024 | 0 + + perl`Perl_safesysmalloc, total bytes = 72106 + value ------------- Distribution ------------- count + 1 | 0 + 2 |@@ 26 + 4 |@@@@@ 72 + 8 |@@@@@@ 101 + 16 |@@@@@@@@@@@@@@ 216 + 32 |@@@@@@@@@@@ 178 + 64 |@ 21 + 128 | 6 + 256 | 2 + 512 | 4 + 1024 | 1 + 2048 |@ 11 + 4096 | 1 + 8192 | 0 + + +Perl malloc byte distributions by Perl file and subroutine, + + func_malloc.pl, func_a, bytes total = 42504 + value ------------- Distribution ------------- count + 16384 | 0 + 32768 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 65536 | 0 + + func_malloc.pl, func_b, bytes total = 100008 + value ------------- Distribution ------------- count + 2 | 0 + 4 |@@@@@@@@@@@@@@@@@@@@ 1 + 8 | 0 + 16 | 0 + 32 | 0 + 64 | 0 + 128 | 0 + 256 | 0 + 512 | 0 + 1024 | 0 + 2048 | 0 + 4096 | 0 + 8192 | 0 + 16384 | 0 + 32768 | 0 + 65536 |@@@@@@@@@@@@@@@@@@@@ 1 + 131072 | 0 + +The func_malloc.pl program allocated around 100 Kbytes by creating a +variable ($b) and populating it with 100,000 "b" characters. This has been +identified in the last distribution plot printed, with one malloc event +of between 64 Kbytes and 128 Kbytes in size. There was also a malloc event +of between 4 and 7 bytes in size. + |
