Originally posted by: SystemAdmin

Hi out there,
I'm not an AIX developer, just trying to port some apps from AIX 5.2 to
new machines (P570) running AIX 5.3. The compiler (cc, xlc) seems to be
running at less than 1/10 the expected speed (compile takes 11 hours
on the new machine as opposed to 2 hours on the old machine). I see
the machine running at [b] 0% idle [/b], with only approx [b]10% CPU [/b]
used for compile, and nothing else worth mentioning running on the machine.

I remember another case where this was caused by the compiler not
being properly licensed. Does this ring a bell with anyone?

Thanks for any help!
#AIX-Forum

Originally posted by: rok_aix

Hi.

Why don't you compare numperm value of two machine.
In my thought, your compile need to open many many files.
In that case, AIX need more file cache for it.
But if there is setted strict maxperm value to 1 in new machine, your compile must to be slow.

good day.
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Originally posted by: SystemAdmin

The values of the old Host:

1. vmo -a |grep perm

minperm% = 10
minperm = 200927
maxperm% = 20
maxperm = 401855
strict_maxperm = 0

The values of the new Host:

1. vmo -a |grep perm

maxperm = 744259
maxperm% = 50
minperm = 148849
minperm% = 10
strict_maxperm = 0

So that is nearly the same....
#AIX-Forum

Originally posted by: nagger

If you are running the compiler without a licence, then you will be hitting a timeout looking for the licence for every file.
I forget the timeout length but it is someting like 20 seconds for every file and will hit compile times very heavily.

Have you tried compiling a "hello world" prog and read any warnings or messages?

Also, are you running the latest Maintenance Level of AIX 5.3 i.e. ML04?
Next, are you running in a logical partition ? If yes what is the CPU, Entitlement and is it capped? This can limit the speed you are running out. You may be comparing a whole CPU to just 10% of one CPU on the p570.
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Originally posted by: SystemAdmin

Hi,

Compile the HelloWorld is not giving any errors....

# cc HelloWorld.c -o HelloWorld
# ll H*
-rw-r--r-- 1 root system 97 May 29 12:04 HelloWorld.c
-rwxr-xr-x 1 root system 4423 May 31 07:23 HelloWorld
# ./HelloWorld
Hello World!
#

After this i get the tip from IBM to isert an extra compile opion: -qnolm
(so no license file checking)
And now it goes 2x as fast.... but still too slow....
Instead of 2 hours it takes now 6 hours....

The New host has 4 virtual proccessors and multithreading (so 8 procecessors visable), and we are using 0,4 CPU = 2.0 RPerf)
(We are using capped mode, min. procs=0.1;max=1 procs, current 0,4 procs)
Name: PowerPC,POWER5 (1.9 GHz POWER5+ Processor)
Node: PowerPC,POWER5@0
Device Type: cpu

The Old Host has 8 CPU (8 x P3 262 MHz = 2.0 Rperf)
Name: PowerPC,RS64-II
Node: PowerPC,RS64-II@0
Device Type: cpu

1. oslevel -r

5300-04

Greetings
Peter

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