Bug 588945 - sparse core files performance hit
sparse core files performance hit
Status: CLOSED ERRATA
Product: Fedora
Classification: Fedora
Component: abrt (Show other bugs)
12
x86_64 Linux
low Severity low
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Assigned To: Denys Vlasenko
Fedora Extras Quality Assurance
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Depends On:
Blocks: 591504
  Show dependency treegraph
 
Reported: 2010-05-04 17:41 EDT by Jan Kratochvil
Modified: 2010-08-24 17:18 EDT (History)
8 users (show)

See Also:
Fixed In Version: abrt-1.1.13-1.fc12
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 591504 (view as bug list)
Environment:
Last Closed: 2010-08-17 01:28:06 EDT
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)
Proposed fix (4.66 KB, patch)
2010-05-07 08:47 EDT, Denys Vlasenko
no flags Details | Diff

  None (edit)
Description Jan Kratochvil 2010-05-04 17:41:56 EDT
Description of problem:
When the core file is large and sparse abrtd slows down the system up to 240x.
GDB gdb.base/bigcore.exp explicitly exploits this problem but it can be seen in other real world core dumps.
If nothing else abrtd should at least optimize write(usercorefile,zeroes) to lseek().

Version-Release number of selected component (if applicable):
abrt-1.0.9-2.fc12.x86_64

How reproducible:
Always.

Steps to Reproduce:
Download some gdb.
./configure
make
cd gdb/testsuite
make site.exp
time runtest gdb.base/bigcore.exp
service abrtd stop
time runtest gdb.base/bigcore.exp

Actual results:
real	1m41.021s (Keith Seitz has reported ~8min on his box)
real	0m2.223s

Expected results:
real	<few secs>
real	0m2.223s

Additional info:
read(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096
write(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096
...
  PID TTY      STAT   TIME COMMAND
   12 ?        S      0:01  \_ [khelper]
21699 ?        D      0:02  |   \_ /usr/libexec/abrt-hook-ccpp /var/cache/abrt 21696 6 502 17179869184
...
/proc/21699/fd/
lr-x------ 1 root root 64 2010-05-04 23:31 0 -> pipe:[11399566]
lrwx------ 1 root root 64 2010-05-04 23:31 1 -> /var/cache/abrt/ccpp-1273008577-21696/coredump\ (deleted)
lrwx------ 1 root root 64 2010-05-04 23:31 2 -> socket:[11401038]
l-wx------ 1 root root 64 2010-05-04 23:31 3 -> /home/.../gdb/testsuite/core.21696
Comment 1 Jan Kratochvil 2010-05-04 17:55:56 EDT
Maybe some hardlink would also help etc., unaware what abrt does there.
Comment 2 Denys Vlasenko 2010-05-07 08:47:03 EDT
Created attachment 412336 [details]
Proposed fix

Run tested.
Comment 3 Denys Vlasenko 2010-05-07 09:15:20 EDT
"time runtest gdb.base/bigcore.exp" with this patch went down from 

real	9m23.708s
user	0m0.285s
sys	0m22.819s

to

real	0m35.821s
user	0m0.318s
sys	0m8.738s
Comment 4 Fedora Update System 2010-08-11 07:09:00 EDT
abrt-1.1.13-1.fc14 has been submitted as an update for Fedora 14.
http://admin.fedoraproject.org/updates/abrt-1.1.13-1.fc14
Comment 5 Fedora Update System 2010-08-12 08:57:44 EDT
abrt-1.1.13-1.fc13 has been submitted as an update for Fedora 13.
http://admin.fedoraproject.org/updates/abrt-1.1.13-1.fc13
Comment 6 Fedora Update System 2010-08-12 15:52:01 EDT
abrt-1.1.13-1.fc14 has been pushed to the Fedora 14 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update abrt'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/abrt-1.1.13-1.fc14
Comment 7 Fedora Update System 2010-08-16 10:06:21 EDT
abrt-1.1.13-1.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/abrt-1.1.13-1.fc12
Comment 8 Fedora Update System 2010-08-17 01:26:36 EDT
abrt-1.1.13-1.fc13 has been pushed to the Fedora 13 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 Fedora Update System 2010-08-20 09:30:55 EDT
abrt-1.1.13-2.fc14 has been submitted as an update for Fedora 14.
http://admin.fedoraproject.org/updates/abrt-1.1.13-2.fc14
Comment 10 Fedora Update System 2010-08-23 21:11:32 EDT
abrt-1.1.13-2.fc14 has been pushed to the Fedora 14 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 Fedora Update System 2010-08-24 17:17:14 EDT
abrt-1.1.13-1.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.

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