Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. What could be the reason for this? Is Asterisk updating wav headers every time it writes? What would be recommended hardware setup for over 60 simultaneous call records? Regards, Vilius. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20101122/4ddf1254/attachment.htm
What format are the actual calls in? Are they in G.711u/a format or are they in something else (perhaps gsm?) format? I'm asking to find out if Asterisk would need to transcode them. On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius <vilius.adamkavicius at invade.net> wrote:> Hi All, > We have a requirement to record over 60 simultaneous calls. Our recording > facilities are implemented using Monitor() over AMI. The thing we have > noticed that making 60 simultaneous call recordings using wav CPU load is > significantly higher (around 2 times more) than using gsm.?Even writing call > recordings to /dev/null makes a big difference in CPU load. > What could be the reason for this? Is Asterisk updating wav headers every > time it writes? > What would be recommended hardware setup for over 60 simultaneous call > records? > Regards, > Vilius. > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > ? ? ? ? ? ? ? http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > ? http://lists.digium.com/mailman/listinfo/asterisk-users >
On Mon, Nov 22, 2010 at 8:47 AM, Vilius Adamkavicius <vilius.adamkavicius at invade.net> wrote:> Hi All, > We have a requirement to record over 60 simultaneous calls. Our recording > facilities are implemented using Monitor() over AMI. The thing we have > noticed that making 60 simultaneous call recordings using wav CPU load is > significantly higher (around 2 times more) than using gsm.?Even writing call > recordings to /dev/null makes a big difference in CPU load.Ignoring your real questions, and asking an alternate question: Why not just record in gsm? If your answer is that you have to play these back on Windows, you can build an on-the-fly gsm-to-wav converter using sox. My understanding is that recording in wav doesn't exactly make you have higher audio quality in your recordings, although the experts at codecs could better answer that.