https://bugs.exim.org/show_bug.cgi?id=1844
Bug ID: 1844
Summary: Building application/PCRE with GCC compiler on AIX6.1
64Bit is taking more time as compared to building with
compiler cc_r
Product: PCRE
Version: 8.34
Hardware: x86-64
OS: AIX
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: pankaj-g@???
CC: pcre-dev@???
Created attachment 891
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https://bugs.exim.org/attachment.cgi?id=891&action=edit
gprof output
Hi Team,
Facing strange issue post building application with PCRE lib on AIX6.1 64Bit
with gcc compiler. Now processing file(1GB) with regex just as string(just one
or two matches) is taking 2-3 time more i.e (5mins approx).
Earlier we were using cc_r compiler(2mins approx).
Further we checked where processing is taking more time using gprof and results
are showing that it is taking more time in most of time in PCRE's match
function. Attaching detailed gprof results for your reference.
Using GCC compiler:Time: 314.80 seconds
% cumulative self self total
time seconds seconds calls ms/call ms/call name
70.2 220.89 220.89 .match [1]
15.2 268.66 47.77 .pcre_exec [2]
Using cc_r AIX compiler: Time: 103.77 seconds
% cumulative self self total
time seconds seconds calls ms/call ms/call name
57.5 59.69 59.69 .match [1]
7.4 67.40 7.71 uitrunc_const [2]
7.0 74.70 7.30 .pcre_exec [3]
3.3 78.15 3.45 .ptScanLineEx [4]
Is there and such known issue or limitation? Can you please look into this and
let us know why it is taking more time when build with gcc. Are we missing
anything?
Note: regex used is a fixed string with just two matches i.e in beginning and
end of file.
Thank you.
Best regards,
Arun Kumar
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