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тАО07-29-2009 08:51 AM
тАО07-29-2009 08:51 AM
uncompress is slow for itanium server
We are tring to uncompress a file on my HPUX11.23 Itanium server (rx8640) and it's size is about 15G. it is quite slow.
I tried to uncompress it on another pa-risc server (rp8440) hpux11.11 and it is much faster. the number of cpus are the almost the same.
anyone knows any kernel paramter to tune for this?
thanks
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тАО07-29-2009 09:05 AM
тАО07-29-2009 09:05 AM
Re: uncompress is slow for itanium server
Using what? "uncompress"? Some PA-RISC
program in an emulator?
> [...] it is quite slow.
Define "quite slow".
> [...] it is much faster.
Define "much".
How busy are these systems?
> the number of cpus are the almost the same.
Does your "uncompress a file" program use
more than one CPU?
> [...] any kernel paramter to tune for this?
I doubt it, but with almost no information on
which to make a judgment, who could know?
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тАО07-29-2009 09:29 AM
тАО07-29-2009 09:29 AM
Re: uncompress is slow for itanium server
1) Itanium server: it is about 3G for 2 mins
pa-risc server: it is about 4G for 2 mins
2)Itanium: 4 cpu, 16G memory
pa-risc: 1cpu, 2G memory
3)disk io are almost the same 90%
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тАО07-29-2009 09:39 AM
тАО07-29-2009 09:39 AM
Re: uncompress is slow for itanium server
> pa-risc server: it is about 4G for 2 mins
So, "quite slow" means 25% slower? I don't
know how these CPUs compare in rated speed.
Should I assume that this IA64 CPU should be
faster than this PA-RISC CPU?
> How busy are these systems?
Still wondering...
> the number of cpus are the almost the same.
> 2)Itanium: 4 cpu, 16G memory
> pa-risc: 1cpu, 2G memory
So, 75% fewer is "almost the same", but 25%
slower is "quite slow"?
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тАО07-29-2009 09:43 AM
тАО07-29-2009 09:43 AM
Re: uncompress is slow for itanium server
It is my first time to notice such issue. so I don't have any clue on why it behaves like that.
My itanium server should be faster. (I assume)
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тАО07-29-2009 10:44 AM
тАО07-29-2009 10:44 AM
Re: uncompress is slow for itanium server
>
> Still wondering...
Still true.
Perhaps "top" or some other tool could tell
you who's doing what on the two systems.
I can imagine all kinds of differences, busy
CPUs, slow disk, busy disk, fragmented disk,
process priority ("nice"), "uncompress"
program itself (Doesn't gzip do ".Z", too?),
...
> [...] (I assume)
Not the most reliable benchmark test.
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тАО07-29-2009 11:11 AM
тАО07-29-2009 11:11 AM
Re: uncompress is slow for itanium server
# time dd if=yourFile of=/dev/null bs=1024k
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тАО07-29-2009 11:17 AM
тАО07-29-2009 11:17 AM
Re: uncompress is slow for itanium server
Or turn it around (and change "null" to
"zero") to check the write speed instead of
the read speed.
Or redirect the expanded output to the null
device.
Or ...
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тАО07-29-2009 12:53 PM
тАО07-29-2009 12:53 PM
Re: uncompress is slow for itanium server
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тАО07-29-2009 01:07 PM
тАО07-29-2009 01:07 PM
Re: uncompress is slow for itanium server
I'm glad that _someone_ knows how busy his
CPUs are. I still don't.