No subject

Tue Jun 18 13:52:11 CDT 2019

as less latency than 4KB.

I was looking for explanation of this behavior  but did not get any.

  1.  MPIR_CVAR_CH3_EAGER_MAX_MSG_SIZE is set to 128KB. So none of the abov=
e message size is using Rendezvous protocol. Is there any partition inside =
eager protocol (e.g. 0 - 512 bytes, 1KB - 8KB, 16KB - 64KB)? If yes then wh=
at are the boundaries for them? Can I log them with debug-event-logging?

Setup I am using:

- two nodes has intel core i7, one with 16gb memory another one 8gb

- mpich 3.2.1, configured and build to use nemesis tcp

- 1gb Ethernet connection

- NFS is using for sharing

- osu_latency : uses MPI_Send and MPI_Recv

- MPIR_CVAR_CH3_EAGER_MAX_MSG_SIZE=3D 131072 (128KB)

Can anyone help me on that? Thanks in advance.

Best Regards,

Abu Naser

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uot;Segoe UI Symbol","Android Emoji",EmojiSymbols">
 

Good day to all,
 

I had run point to point osu_lat=
ency test in two nodes for 200 times.  Followings are the average time=
 in microsecond for various size of the messages -

<div>1KB    84.8514 us 
2KB    73.52535 us=
 
4KB    272.55275 us 
8KB    234.86385 u=
s 
16KB    288.88 us 
32KB    523.3725 us 
64KB    910.4025 us</div>

 

From the above looks like, 2KB m=
essage has less latency than 1 KB and 8KB has less latency than 4KB.
 

I was looking for explanation of=
 this behavior  but did not get any.
 

<ol style=3D"margin-bottom:0px; margin-top:0px">
<li>MPIR_CVAR_CH3_EAGER_MAX_MSG_SIZE is set to 128KB. So=
 none of the above message size is using Rendezvous protocol. Is there any =
partition inside eager protocol (e.g. 0 - 512 bytes, 1KB - 8KB, 16KB - 64KB=
)? If yes then what are the boundaries
 for them? Can I log them with debug-event-logging? 
</li></ol>
 

Setup I am using:
- two nodes has intel core i7, o=
ne with 16gb memory another one 8gb
- mpich 3.2.1, configured and bu=
ild to use nemesis tcp
- 1gb Ethernet connection
- NFS is using for sharing 

- osu_latency : uses MPI_Send an=
d MPI_Recv
- MPIR_CVAR_CH3_EAGER_MAX_=
MSG_SIZE=3D
131072 (128KB) 

 

Can anyone help me on that? Than=
ks in advance. 

 

 

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<div id=3D"divtagdefaultwrapper" dir=3D"ltr" style=3D"font-size:12pt; color=
:rgb(0,0,0); font-family:Calibri,Helvetica,sans-serif,"EmojiFont"=
,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,&q=
uot;Segoe UI Symbol","Android Emoji",EmojiSymbols">
 

Best Regards,
</=
span>
<div align=3D"left"></div>
</=
span>
Abu Naser 

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