However, over time the conclusion has been that the performance in general is pathetic. SSH login prompt takes about a minute or so to ask for password. This could be due to other issues, e.g. DNS response, so I thought it might be a one-time think i.e. at login only. However, the minute you are logged in to the console, simple commands like ls, uname, hostname, etc. take a few 10s of seconds to provide any kind of output.
Today has been the worst though. An apt update command took several minutes to get the updates from a us.debian.org repository, and apt upgrade command downloaded files at almost "dial-up era" speeds.
Get:24 http://http.us.debian.org/debian/ stable/main libxapian22 amd64 1.2.19-1+deb8u1 [983 kB]
Get:25 http://http.us.debian.org/debian/ stable/main openssl amd64 1.0.1t-1+deb8u2 [664 kB]
Fetched 49.7 MB in 12min 9s (68.2 kB/s)
Reading changelogs... Done
Preconfiguring packages ...
To top it all, was the error message below:
Message from syslogd@cacVM at Jun 5 17:07:31 ...
kernel:[2320366.614749] BUG: soft lockup - CPU#1 stuck for 22s! [mandb:1286]
SSH connection started at: 16:08:36
APT update and upgrade staus now 17:37:00
Progress: [ 52%] [###########################.........................]
Update:
Here are three commands run on the clouldatcost(CAC) VM compared to the same commands run on a VM on a homebrew Xenserver host.
| Command | CAC VM output | xen VM output |
| ~$ time date | Sun Jun 5 23:06:11 EDT 2016 real 0m3.468s user 0m1.296s sys 0m2.136s | Sun Jun 5 23:12:15 EDT 2016 real 0m0.002s user 0m0.000s sys 0m0.000s |
| ~$ time uname -a | Linux cacGuest 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-1 (2016-03-06) x86_64 GNU/Linux real 0m6.387s user 0m1.372s sys 0m4.360s | Linux xenGuest 4.5.0-2-amd64 #1 SMP Debian 4.5.5-1 (2016-05-29) x86_64 GNU/Linux real 0m0.002s user 0m0.004s sys 0m0.000s |
| ~$ time host google.com | google.com has address 172.217.2.142 google.com has IPv6 address 2607:f8b0:400b:80b::200e google.com mail is handled by 40 alt3.aspmx.l.google.com. google.com mail is handled by 30 alt2.aspmx.l.google.com. google.com mail is handled by 10 aspmx.l.google.com. google.com mail is handled by 20 alt1.aspmx.l.google.com. google.com mail is handled by 50 alt4.aspmx.l.google.com. real 2m9.744s user 0m8.400s sys 0m51.124s | google.com has address 172.217.3.142 google.com has IPv6 address 2607:f8b0:400b:806::200e google.com mail is handled by 10 aspmx.l.google.com. google.com mail is handled by 50 alt4.aspmx.l.google.com. google.com mail is handled by 20 alt1.aspmx.l.google.com. google.com mail is handled by 30 alt2.aspmx.l.google.com. google.com mail is handled by 40 alt3.aspmx.l.google.com. real 0m0.550s user 0m0.024s sys 0m0.008s |
No comments:
Post a Comment