topic Memory Bottleneck probability= 100.00% in Operating System - HP-UX

Memory Bottleneck probability= 100.00%

Murdius — Fri, 27 Nov 2015 18:06:50 GMT

My HP-UX system is behaving slow and I'm trying the find the root cause for it.

I ran glance -m and see:

------------------------------------------------------------------------------------------------------------------------------------------------------
CPU Util S SU U | 33% 31% 47%
Disk Util V V | 70% 85% 100%
Mem Util S SU U |100% 99% 100%
Swap Util U UR R | 63% 63% 63%
------------------------------------------------------------------------------------------------------------------------------------------------------
MEMORY REPORT Users= 43
Event Current Cumulative Current Rate **bleep** Rate High Rate
--------------------------------------------------------------------------------
Page Faults 43216 649056 8473.7 4445.5 8473.7
Page In 26204 454409 5138.0 3112.3 7498.3
Page Out 10931 470690 2143.3 3223.9 3011.1
KB Paged In 102mb 1.73gb 20552.1 12449.5 121510.8
KB Paged Out 42.7mb 1.80gb 8573.3 12895.6 38053.3
Reactivations 0 0 0.0 0.0 0.0
Deactivations 0 0 0.0 0.0 0.0
KB Deactivated 0kb 0kb 0.0 0.0 0.0
VM Reads 29511 983692 5786.4 6737.6 11359.2
VM Writes 10032 563283 1967.0 3858.1 8212.3
Total VM : 8.1gb Sys Mem : 14.7gb User Mem: 553mb Phys Mem : 16.0gb
Active VM: 7.3gb Buf Cache: 0mb Free Mem: 31mb FileCache: 778mb
MemFS Blk Cnt: 0 MemFS Swp Cnt: 0

As well as the red alert Memory Bottleneck probability= 100.00%

Do I have a memory bottleneck and what are my options of resolving it?

Thanks in advance!

Re: Memory Bottleneck probability= 100.00%

Dennis Handly — Mon, 30 Nov 2015 19:13:07 GMT

>Do I have a memory bottleneck and what are my options of resolving it?

Sure looks like it. Add more memory to the system. Or run less processes.

What does "/usr/sbin/swapinfo -tam" show?

Re: Memory Bottleneck probability= 100.00%

Bill Hassell — Sat, 28 Nov 2015 03:05:11 GMT

The page out rate and swap usage seems to indicate a severe memory shortage. To accomodate more processes than will fit into memory, HP-UX is deactivating and paging some processes out to the swap area. The ony solutions are already mentioned: run less processes and add another 16 GB of RAM.

Re: Memory Bottleneck probability= 100.00%

Murdius — Mon, 30 Nov 2015 19:11:18 GMT

It shows ...

sh: swapinfo: not found.

Any other command I could use?

Re: Memory Bottleneck probability= 100.00%

Dennis Handly — Mon, 30 Nov 2015 19:21:08 GMT

>It shows ... sh: swapinfo: not found.

I would assume a sysadmin would have /usr/sbin in his PATH. :-)

Re: Memory Bottleneck probability= 100.00%

Murdius — Mon, 30 Nov 2015 20:23:32 GMT

Well here's the usr/sbin/swapinfo -tam info:

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 16384 3771 12613 23% 0 - 1 /dev/stuff
reserve - 1421 -1421
memory 15580 14638 942 94%
total 31964 19830 12134 62% - 0 -

Re: Memory Bottleneck probability= 100.00%

Dennis Handly — Tue, 01 Dec 2015 13:09:47 GMT

>here's the swapinfo -tam info:

As we suspected, this just shows you have nearly used up RAM and 23% of swap.