Experimental Physics and
Industrial Control System

Hi Murali,

 

I had some data back from testing, the http post request is asking for about 3000 PVs from the AA which stores about 4500 PVs Total in the LTS.

 

I did the benchmark test to just transfer a single pb file and was getting around 100MB/s, so I do not think it has to do much with the network since the file size for the 3000 PVs is about 40MB only.  I then reduced the request down to about 1200 PVs and it definitely sped up quite a bit around 15 seconds from the 2.5mins it was taking.  Someone mentioned the lookup time for each PV was log(n) or nlog(n) for the AA but then that doesn’t seem like it would impact going from 1200 to 3000 in the POST.

 

I am curious how many PVs you usually request in a single http  when requesting from the AA, is there an upper limit I should stick to?  You mentioned possibly breaking up the requests into smaller chunks. 

 

Thanks

Adam

 

 

 

Thanks Murali,

 

I will try to run some more tests including the one that was mentioned to make sure the transfer rates look correct.  I cant imagine the local vs NAS on this small of a setup shouldnt be vastly different.