j3d1/webvirtcloud
1
0
Fork 0
mirror of https://github.com/retspen/webvirtcloud synced 2026-11-10 12:16:49 +00:00
Code Issues Projects Releases Wiki Activity

perf(instances): VM statistics sample all devices in one second

Browse source 
Each open VM page asks for its statistics every 10 seconds. For a
running VM the stats view measured the CPU, then each disk, then each
NIC, sleeping one second for each. With two disks and a NIC a request
held a sync gunicorn worker for over 4 s, so a few dozen open VM pages
could keep every worker busy.

wvmInstance.usage() replaces cpu_usage, disk_usage and net_usage, the
stats view's only callers: it reads all counters, sleeps one second
once and reads them again. Values and units are unchanged (CPU percent
of the host, disk bytes, network bits per second); compared against the
previous methods on the same counters, the results are identical.

Measured on the test host for a running VM with two disks and a NIC:
the stats request took 4.1-4.3 s before, 1.1-1.3 s now. The new test
fails on the previous code.
This commit is contained in:
catborise 2026-10-05 15:27:55 +03:00
parent f3929b8e8f
commit 5bb3a545a0
3 changed files with 116 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

4
instances/views.py
View file

@ -236,10 +236,8 @@ def stats(request, pk):
json_net = []
# TODO: stats are inaccurate
cpu_usage = instance.proxy.cpu_usage()
cpu_usage, blk_usage, net_usage = instance.proxy.usage()
mem_usage = instance.proxy.mem_usage()
blk_usage = instance.proxy.disk_usage()
net_usage = instance.proxy.net_usage()
current_time = time.strftime("%H:%M:%S")
for blk in blk_usage: