Re: Speed comparisons: P9 vs P10

A few follow-up questions:

On the P9, are the local SSDs SAS or NVMe? The performance difference between SAS and NVMe is an order of magnitude - 10x-20x isn't uncommon, and since this is a workload that's primarily I/O bound, better disks makes a bigger difference than a better CPU. Back in the day, when we were building the Mono packages for the IBM i OSS repo's we managed to reduce the build time from ~6 hours for the entire source tree to ~45 minutes when we got rid of the RAID array with 15kRPM disks and replaced it with SAS SSDs.

Also - bear in mind that two layers of IBM i also adds a performance penalty; VIOS is much better at virtualising I/O and typically doesn’t run it's own payloads either.

Another thing I've observed is that IBM i PASE is slow, both compared to AIX and especially compared to Linux. I've worked a lot with PASE, and process creation/destruction/forks are very expensive operations compared to unices or unix-like environments because of the translation layer.

On 09/07/2024, 20:55, "MIDRANGE-L on behalf of Rob Berendt" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx <mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of robertowenberendt@xxxxxxxxx <mailto:robertowenberendt@xxxxxxxxx>> wrote:


Thought you might enjoy this speed comparison.


Two Domino servers. On different Power systems. They are Domino clusters
which basically replicate the same databases between each.
Dedicated compact completed when the Domino server was not running.


MAIL3: Power 10 9105-41B with VIOS hosted SAN based NVMe drives, 1
processor, 128GB memory
07/08/2024 09:35:41 Compacting QuoteStubArchive.nsf (Group Dekko Quote
Stubs Archive), -c -i -d
07/08/2024 11:31:42 Recovery Manager: Assigning new DBIID for
/GDDATA3/NOTES/DATA/QuoteStubArchive.nsf (need new backup for media
recovery).
07/08/2024 11:31:44 Compacted QuoteStubArchive.nsf, increased by 3584K
bytes (<1%), -c -i -d
Duration: 01:56:03


MAILTWO: Power 9 9009-41A with internal SSD drives, IBM i hosting IBM i.
1.5 processors, 162GB memory
07/09/2024 10:51:28 Compacting quotestubarchive.nsf (Group Dekko Quote
Stubs Archive), -c -i -d
07/09/2024 14:35:40 Recovery Manager: Assigning new DBIID for
/GDDATA2/NOTES/DATA/quotestubarchive.nsf (need new backup for media
recovery).
07/09/2024 14:35:44 Compacted quotestubarchive.nsf, 3840K bytes
recovered (<1%), -c -i -d
Duration: 03:44:16