|
Thanks
for your efforts
You can see the drop
in performance starts to get really bad at about 9 CPUs and
beyond
If you increase
guest vCPU number, the bottleneck may be dom0 vCPU number( only 1vCPU for
dom0).
You can try
configure two/four vCPU for dom0, the performance may be
back.
a curious
question,
Alex said there are
~70% degradation on RE-AIM7,
Your test result
seems much better than his.
What's the
difference of your test environment?
Thanks,
Anthony
Hi everyone,
A follow-up on the multiprocessor performance benchmark on
HVM guests.
We ran the RE-AIM7 benchmarks on a 5-cell (40 CPU) machine
and a single-cell 8-cpu NEC machine.
Here are the jobs per minute maximums.
You can see the drop in performance starts to get really bad
at about 9 CPUs and beyond.
Questions:
1.
What can I do to help improve this
situation?
2.
Are there any other experiments I can
run?
3.
What tools/profilers will help to gather more data
here?
I am very interested in helping to solve this problem! Thanks
for your ideas and suggestions.
Best regards,
---Kayvan
|
|
|
|
|
|
Xen
performance comparison on 5-Cell NEC machine (each cell with 4 dual-core
Itaniums) |
|
|
|
|
|
|
|
|
|
CPUs |
Native
Jobs/Min |
HVM
Jobs/Min |
Overhead |
|
|
|
|
1 |
2037 |
1791 |
12.08% |
|
|
|
|
2 |
4076 |
3615 |
11.31% |
|
|
|
|
3 |
6090 |
5221 |
14.27% |
|
|
|
|
4 |
8118 |
6839 |
15.76% |
|
|
|
|
5 |
10119 |
8404 |
16.95% |
|
|
|
|
6 |
12037 |
9949 |
17.35% |
|
|
|
|
7 |
14106 |
11095 |
21.35% |
|
|
|
|
8 |
15953 |
12360 |
22.52% |
|
|
|
|
9 |
18059 |
13201 |
26.90% |
|
|
|
|
10 |
20170 |
13742 |
31.87% |
|
|
|
|
11 |
21896 |
13694 |
37.46% |
|
|
|
|
12 |
24079 |
13331 |
44.64% |
|
|
|
|
13 |
25992 |
12374 |
52.39% |
|
|
|
|
14 |
28072 |
11684 |
58.38% |
|
|
|
|
15 |
29931 |
11032 |
63.14% |
|
|
|
|
16 |
31696 |
10451 |
67.03% |
|
|
|
|
|
|
|
|
|
|
|
|
The
guest OS was CentOS-4.6 with 2GB of memory, |
|
|
|
|
running
under a Dom0 that was limited to 1 VCPU. |
|
|
|
|
|
|
|
|
|
|
Xen
performance comparison on 1-Cell NEC machine (4 dual core Itanium
Montecito) |
|
|
|
|
|
|
|
|
|
CPUs |
Native
Jobs/Min |
HVM
Jobs/Min |
Overhead |
|
|
|
|
1 |
2037 |
1779 |
12.67% |
|
|
|
|
2 |
4067 |
3619 |
11.02% |
|
|
|
|
3 |
6097 |
5344 |
12.35% |
|
|
|
|
4 |
8112 |
7004 |
13.66% |
|
|
|
|
5 |
10145 |
8663 |
14.61% |
|
|
|
|
6 |
12023 |
10213 |
15.05% |
|
|
|
|
7 |
14083 |
11249 |
20.12% |
|
|
|
|
8 |
16182 |
12969 |
19.86% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The
guest OS was CentOS-4.6 with 2GB of memory, |
|
|
|
|
running
under a Dom0 that was limited to 1 VCPU. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 
