Re: [Iometer-devel] [Iometer-user] IOMeter Workers under different managers use the same location for Random read/write.

[Ming Z. <mi...@el...>]

On Mon, 2006-10-30 at 16:00 -0700, Liang Yang wrote:
> Hi,
> 
> IOMeter originally plan to use multiple managers for multiple machines (each 
> machine get its own manager). However, I do find some problems when I 
> spawned multiple managers on the same machine (multiple instances of dynamo 
> are spawned on the same Linux platform).

why u want to run multiple dynamo on same box?

> 
> It seems those workers from different managers all use the same position for 
> random read/write, this bring up cache effect even for random read/write 
> after comparing the data between single manager and multiple managers with 
> the same number of I/Os(cache effect for sequential read/write with multiple 
> workers is obvious as they re-read/re-write the same address).

yes, quiet possible.

> 
> I think the same random number icould be broadcasted to all managers instead 
> of broadcasting a unique random number to each manager. This may not be a 
> good design even though people typically think managers should be on 
> different machines.

it could be changed to start from different seeds.

> 
> Can anyone give me some thoughts here?
> 
> Thanks,
> 
> Liang
> 
> 
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Iometer-user mailing list
> Iom...@li...
> https://lists.sourceforge.net/lists/listinfo/iometer-user