[codes-ross-users] codes simple net problems

[Jenkins, Jonathan P.]

Yes, model-net lps maintain a message queue and release "packet_event"s to the underlying implementation one at a time to avoid flooding the sim engine with messages. So if you have a 1G message and a 512-byte packet size, then a large number of events will be generated (ie more time is needed).

Thanks,
John

On 9/30/16, 8:43 AM, "Mubarak, Misbah" <mmubarak at anl.gov> wrote:

    Hi Lei,
    
    Here is some feedback regarding your questions:
    
    - Yes, for transferring large data through simple-net you will need to use
    the message_size parameter.
    
    In terms of simulation performance, I had a question for John i.e. do we
    break down messages into packets at the model-net layer for simple-net
    model as well? If so, the simulation may be getting slower due to a use of
    very small packet size (by default it is 512 bytes in the configuration
    file). 
     
    - The bandwidth is in Megabytes per seconds. Since we are using all lower
    cases, it gets confused by Mbps. To make this clear, I have added the
    bandwidth units in the example config file.
    
    Thanks,
    Misbah 
    
    On 9/30/16, 5:23 AM, "codes-ross-users-bounces at lists.mcs.anl.gov on behalf
    of 于雷（Yu Lei）" <codes-ross-users-bounces at lists.mcs.anl.gov on behalf of
    yulei at buaa.edu.cn> wrote:
    
    >Hi John,
    >
    >we have two questions about simple-net model.
    >
    >1/If we want to transfer "big data" between two servers, like 100GB, we
    >only need to set the parameter message_size to 100*1024*1024*1024 in the
    >method model_net_event_return model_net_event_annotated(
    >         int net_id,
    >         char const * annotation,
    >         char const * category,
    >         tw_lpid final_dest_lp,
    >         uint64_t message_size,
    >         tw_stime offset,
    >         int remote_event_size,
    >         void const * remote_event,
    >         int self_event_size,
    >         void const * self_event,
    >         tw_lp *sender);
    >
    >Am I right? Because when we change the parameter message_size to
    >100*1024*1024*102, the simulation becomes very slow.
    >
    >2/In the configuration file of simple-net, net_bw_mbps="4000" means the
    >bandwidth is 4000*1024*1024 bit/s and   4000*1024*1024/8 byte/s?
    >
    >Thanks,
    >
    >
    >Lei
    >
    >
    >
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