performance regression after 3.1

[Xose Vazquez Perez]

hi,

3.1 : is fine
3.2 : bad performance <---- bug since 3.2
3.3.x : bad performance
git-tree : bad performance

OS: Fedora 17
kernel: 3.9.4-100
x86_64 machine

test done with ebizzy-0.3 <http://ebizzy.sf.net>
code: http://sf.net/projects/ebizzy/files/latest/download?source=files


jemalloc-3.3.1:

$ LD_PRELOAD=/usr/lib64/libjemalloc.so.1 ./ebizzy -s 131072
47525 records/s
real 10.00 s
user  5.99 s
sys  13.54 s

ebizzy shows very low records.

$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 4  0      0 5868732 106904 1055100    0    0     0     0 18170 1356 13 25 62  0
 4  0      0 5868804 106904 1055188    0    0     0     0 50193 1538 34 67  0  0
 4  0      0 5868804 106904 1055188    0    0     0     0 49276 1721 31 69  0  0
 5  0      0 5868772 106904 1055164    0    0     0     0 50630 1502 33 67  0  0
 4  0      0 5868804 106904 1055164    0    0     0     0 50525 1461 32 68  0  0
 4  0      0 5868804 106904 1055108    0    0     0     0 50602 1526 32 68  0  0
 4  0      0 5868796 106904 1055108    0    0     0     8 50151 1519 33 67  0  0
 4  0      0 5868772 106904 1055116    0    0     0     0 50355 1497 30 70  0  0
 4  0      0 5868804 106904 1055116    0    0     0     0 50216 1494 29 71  0  0
 4  0      0 5868804 106904 1055116    0    0     0     0 50395 1522 30 70  0  0
                                                          ^^^^^         ^^
system time is too high, and also system interrupts.



Same test done with jemalloc-3.1.0 (glibc-2.15 and tcmalloc-2.0 get similar results):

$ LD_PRELOAD=/home/xose/bajar/j/3.1/lib64/libjemalloc.so.1 ./ebizzy -s 131072
335568 records/s
real 10.00 s
user 19.55 s
sys   0.01 s

$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 4  0      0 5844152 107644 1067828    0    0     0     0 2579 1862 100  0  0  0
 4  0      0 5839812 107644 1071980    0    0     0     0 2558 1676 99  1  0  0
 4  0      0 5839564 107652 1071940    0    0     0    12 2574 1669 100  1  0  0
 4  0      0 5843292 107652 1067740    0    0     0     0 2548 1651 99  1  0  0
 4  0      0 5839348 107652 1071900    0    0     0     0 2532 1637 100  1  0  0
 4  0      0 5839100 107652 1071868    0    0     0     0 2549 1652 100  1  0  0
 4  0      0 5842500 107652 1067740    0    0     0     0 2553 1648 99  1  0  0
 4  0      0 5842284 107652 1067772    0    0     0     0 2562 1670 99  1  0  0
 4  0      0 5838324 107652 1071900    0    0     0     0 2556 1759 99  1  0  0
 0  0      0 5852096 107652 1071868    0    0     0     0 2583 1904 97  1  2  0

-thanks-