Free System Page Table Entries

[Cineca2]

I have a FMS 3.5 installed on windows 2003 server, with a NFS file system.

Both the application directory and the data directory is on the network file system.

Every two weeks the system became unstable because the Free system PTEs go under 2000.

The only strange thing i've noticed is that the Virtual size of the FMScore grows to about 1.300.000K  after few hours from the reboot of the machine and stay to this value indipendently   from the load of the server, In another FMS installed on a machine without the network file system this value is 16.800 K.

Someone has a similar strange problem?

[Guest]

Have you increased the size of the FLvCache from the default 500M? On all of my Win2k3 systems, large volumes of memory use tend to come from VOD applications. It seems that FMS will hold data in the FLV cache indefinitely, so if you increased the size of the cache, that would explain a core consuming so much memory.

[Cineca2]

thanks for the replay.

No, the cache is still 500MB.

The network disk is 2TB large. Can this be a problem?

Is there a way to make FMS to free the cache?

thank you again

[Asa_-_FMS]

FMS is likely experiencing bottlenecking in handling both a remote content and application directory when under load and translating that load into memory work items that leads to your memory growth so rapidly.  While I'm not going to be able to join you in an investigation directly without a support case, I can indicate what we would recommend in that case to get to the bottom of this and you can do it yourself.

Really you want to find the critical bottleneck.  I would start with running the same scenario with a local application folder - typically FMS does NOT expect its application folder to be remote as there tends to be little content contained therein and threads and locking are designed around quick access to that folder.

Following that, it's worth determining the expected throughput from the remote drive servicing your content and making sure it can keep up with the requests.  If it can't you'll actually begin to buffer threads and requests FMS side and this will appear as a memory growth while they're waiting for the disk queue to respond.  Checking disk queue length can confirm this kind of problem for you.

Good luck with the investigation and feel free to contact us at adobe if your company needs to open a support incident to work on the case.

Asa

awhilloc@adobe.com

[Cineca2]

I've put the application dir on a local disk, but the problem is still existing.

I've asked to the server administrator to check the disk cache.

I guess if the problem is the file system; we have a gpfs exported using nfs.The total  disk space is about 2TB but I've noticed that every files takes a disk space of 32Mb, i.e. a file of 1Kb takes 32Mb of disk. I'm not an expert of file systems but i guess if this can be a problem, expecially for the cache.

I've forgot to say that the problem is present only with FMS, we have another server with the same configuration but hostng a windows media server and a real server, without any issue.

Paolo

[Asa_-_FMS]

Perhaps then it's the content being on the remote disk - can you test by putting some portion of the content onto local disk - perhaps with a carefully chosen virtual directory mapping to see if that makes the difference?

Understood on the FMS only - can't resolve that data point currently, but looking at the obvious points of integration here for likely causes.

Asa

[Cineca2]

yes, I think that the problem is the remote disk too.  But I do not know how to solve it.

Thank you for your replay, anyway