Re: [Gems-users] Message Delayed Cycles

["Lei Yang" <lya755@xxxxxxxxxxxxxxxxxxxx>]

Thanks Hongxia. But the two systems I compared used the same latency numbers and same network topology. I guess I want to understand first what decides the msg delay cycles in addition to these latency parameters. Any idea about that?

 

Lei

----- Original Message -----

From: hongxia sun

To: Lei Yang ; Gems Users

Sent: Thursday, April 19, 2007 8:37 PM

Subject: Re: [Gems-users] Message Delayed Cycles

Hi Lei,

 

Have you ever changed latency parameters in ruby.defaults? The protocol MSI_MOSI_CMP_directory used the following parameters related latency:

L1_RESPONSE_LATENCY, L2_RESPONSE_LATENCY, L!_REQUEST_LATENCY, L2_REQUEST_LATENCY, MEMORY_RESPONSE_LATENCY_MINUS_2, NETWORK_LINK_LATENCY.

Moreover, the network topology you used also influenced the network latency.

 

Hope it can be help.

 

Regards,

SUN Hongxia

 

2007/4/20, Lei Yang <lya755@xxxxxxxxxxxxxxxxxxxx>:

Dear list,

 

I noticed that after I made some change to the MSI_MOSI_CMP_directory protocol, the network delay cycles were significantly increased.

 

Below I'm pasting the virtual network 1 delay cycles of unmodified protocol and modified protocol. (Virtual network 1 is the network that connects the local l2s to the directory).

 

unmodified:

virtual_network_1_delay_cycles: [binsize: 1 max: 15 count: 330763 average: 1.18152 | standard deviation: 2.62497 | 274530 2 18 249 191 181 64 172 54618 276 116 23 38 9 29 8 41 ]

modified:

virtual_network_1_delay_cycles: [binsize: 4 max: 194 count: 289410 average: 9.86392 | standard deviation: 27.4408 | 216910
45290 453 237 12 49 34 41 40 447 44 54 48 43 70 29 110 87 76 119 85 34 11754 246 568 11396 230 894 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 ]

Could anyone please tell me what is the dominant factor of message delay cycle?  For example, I changed the DIRECTORY_TRANSITION_PER_RUBY_CYCLE parameter from 32 to 256 in rubyconfig.defaults . Because my modifications introduced more message sent to the directory and I thought the number of requests that can be handled by the directory  in one cycle matters. However, this doesn't help at all. I would really appreciate any hint from you. Thanks in advance!

 

Lei

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