Stress Test 2012-03-05

Results

Transcoding G729-G711	Media Pass-through	Short Calls (Random 0-300s)	Reached calls
			~250
			~500
			~1000
			4599

Conclusions

• RAM is not important sending calls. Maximum usage 2.5 Gb was reached but mainly due to GUI usage (Active Calls and some stats pages)
• CPU is very important - the faster, the better
• SSD disc RAID1 really helped a lot in high CPS sessions
• MySQL service took < 10% at peak times and is not important
• Asterisk service takes major CPU power and is main bottleneck in the long run
• Voice quality degrades at the time of high CPS (high HDD usage)
• 20 CPS reached without problems, if more - Asterisk chokes

Used hardware

3 equal servers:

CPU:	Intel Core i5-2400 (4 Cores)
HDD:	2x 120 GB SSD (RAID1)
RAM:	16 GB DDR3
LAN:	100 Mbps

Setup

Origination server -> Measured Server -> Termination server

One call was always life for testers to hear audio (MOH), to notice when quality degrades.

Calls were originated using script which generates call files in batches (5-10-20-50-100).

Destination was random in a format XXXXXXXXXX, where X in [0..9]

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See also:

• Performance tests