First, as you can see from the very fast response times for "simpler"
commands like a STAF ping request, the STAF Local Inter-Process
Communication (IPC) Connection Provider (which is used when you specify
"local" or "local://local" for the machine) is very fast (0.0009 seconds)
-- so communication using the STAF Local IPC Connection Provider is not
slow. There are actually a lot of things done by the PROCESS service
itself under the covers. In particular, when using the WAIT option, the
PROCESS service has to be notified when the command that it started is
complete and access the process completion information. Generally, the
command that is run via a STAF PROCESS START request is longer running
(e.g. a Java application, etc) than a simple "ls" command) so the < than 1
second time it takes for STAF is insignificant. Note that if you have a
lot of simple OS commands like "ls", you may want to put them into a shell
script and then submit a STAF PROCESS START request to run the shell
script for faster performance.
When you submit a STAF service request to a remote machine, then you
specify its TCP/IP host name or IP address and the STAF TCP/IP connection
provider (either the secure SSL or regular STAF TCP/IP Connection
Provider) is used which use TCP/IP for communication. Using STAF to
communicate between machines is where you start to understand the power of
STAF.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
From: 邓悟 <den...@taobao.com>
To: Sharon Lucas/Austin/IBM@IBMUS
Cc: "staf-users@lists.sourceforge.net"
<staf-users@lists.sourceforge.net>
Date: 07/19/2011 09:20 PM
Subject: 答复: [staf-users] speed issue of staf
Great thanks for Lucas!
In our using scenarios, we need to get the string response from staf in
most cases. I want to reduce the time for the requests with response
returned.
In my opinion, the execution time for “ls /” doesn’t take so much time,
may be most of the time is spent on the communication between staf client
and staf server. I guess the communication is based on TCP, right?
My confusion is that what makes the communication so slow? Any idea to
refine it?
发件人: Sharon Lucas [mailto:luc...@us.ibm.com]
发送时间: 2011年7月19日 23:27
收件人: 邓悟
抄送: staf-users@lists.sourceforge.net
主题: Re: [staf-users] speed issue of staf
That's because you are submitting a PROCESS START request using the WAIT
option so it has to wait for the process to complete. If you didn't
specify the WAIT option, you'd see that each PROCESS START request takes
only 0.007 seconds. Or, if you specified a simpler request like a STAF
PING request, it only takes 0.0009 seconds.
Note: STAFLoop is an executable we provide that allows you to get some
performance information on submitting STAF service requests.
[root@staf1e ~]# STAFLoop 10 local PROCESS START SHELL COMMAND "ls /"
RETURNSTDOUT STDERRTOSTDOUT WAIT
Total loops: 10
Total time : 9.723
Avg. time : 0.972 <== With the WAIT option, each PROCESS
START request takes almost 1 second on my Linux machine.
Loops/sec : 1.02849
[root@staf1e ~]# STAFLoop 10 local PROCESS START SHELL COMMAND "ls /"
RETURNSTD
OUT STDERRTOSTDOUT
Total loops: 10
Total time : 0.075
Avg. time : 0.007 <== Without the WAIT option, each PROCESS
START request only takes 0.007 seconds per PROCESS START request
Loops/sec : 133.333
[root@staf1e ~]# STAFLoop 10 local PING PING
Total loops: 10
Total time : 0.009
Avg. time : 0.000 <== A simple STAF PING request only takes
0.0009 seconds (so that 1,111 STAF PING requests can be submitted in 10
seconds)
Loops/sec : 1111.11
[root@staf1e ~]# STAFLoop 10 local PING PING
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
From: 邓悟 <den...@taobao.com>
To: "staf-users@lists.sourceforge.net"
<staf-users@lists.sourceforge.net>
Date: 07/18/2011 09:45 PM
Subject: [staf-users] speed issue of staf
Sorry to interrupt you.
I’m using staf in linux x86_64 platform. A simple request takes about 1
second each time. That’s too long to serve a local request. Any one has
idea?
Command is:
staf local PROCESS START SHELL COMMAND ls / WAIT RETURNSTDOUT
STDERRTOSTDOUT
Response
--------
{
Return Code: 0
Key : <None>
Files : [
{
Return Code: 0
Data : bin
boot
cache
dev
etc
home
lib
lib64
lost+found
media
misc
mnt
opt
proc
root
sbin
selinux
srv
sys
tmp
usr
var
}
]
}
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