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Profile Olivier Fehr
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Message 31937 - Posted: 13 Aug 2017, 7:51:01 UTC - in response to Message 31935.

@Ivan, Jim1348

It's a bit OT here, therefore only some very short remarks.

CERN's vbox apps can get a huge benefit from a local squid.
CMS benefits most, then ATLAS and LHCb, Theory less but sufficient.
Up to 95 % regarding the request hits and 50 % regarding the byte hits.
The setup needs some special tuning compared to the standard setup and should get some assist from iptables.

An "old" computer with a core 2 duo, 1-2 GB RAM (250-350 MB for squid), 30-80 GB free disk space is far enough.
And there is also a benefit for fast DSL lines as the squid avoids latency.


Thanks for that insight. I going to try this, since I have a squid running already.

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Message 31939 - Posted: 13 Aug 2017, 10:18:36 UTC - in response to Message 31935.

@Ivan, Jim1348

It's a bit OT here, therefore only some very short remarks.

CERN's vbox apps can get a huge benefit from a local squid.
CMS benefits most, then ATLAS and LHCb, Theory less but sufficient.
Up to 95 % regarding the request hits and 50 % regarding the byte hits.
The setup needs some special tuning compared to the standard setup and should get some assist from iptables.

An "old" computer with a core 2 duo, 1-2 GB RAM (250-350 MB for squid), 30-80 GB free disk space is far enough.
And there is also a benefit for fast DSL lines as the squid avoids latency.

Yes, you are right there, I wasn't considering that use case. Every running instance (of the CMS app at least) has its own cvmfs built-in to the VM. A local squid would definitely help if you run several instances. Do you have a guide as to how to re-direct the VMs to a local squid instead of, e.g. lhchomeproxy1.cern.ch:3404 which is baked-in to the CMS vdi?
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Message 31941 - Posted: 13 Aug 2017, 13:11:37 UTC
Last modified: 13 Aug 2017, 13:15:00 UTC

I have two Linux boxes with SSE2 capability. Yet one of them, the E-450 CPU is receiving SixTrack Tasks with no sse2 or pni, resulting in very long running times. One is going to be late. The preceding task was completed and validated in 399,883.43 s. This is computer 10492633. The other computer,10492932, an Opteron 1210 CPU, is running Einstein@home CPU tasks with AVX.
Tullio

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Message 31976 - Posted: 16 Aug 2017, 20:27:43 UTC

As I have asked on the Wishlist, there should be a listing of the ATLAS beta tasks on the Project Status page, so we know what is going on (or not).

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Message boards : News : New ATLAS app version released for Linux hosts