Alain Roy wrote:
At 11:25 PM 8/2/2006 -0700, Michel Drescher wrote:
Hi Alain,
please find my answers inlined below.
Thank you for your thoughtful comments. I have one or two respones.
3) IndividualCPUCount allows me to specify a range in terms of double: what does this mean? For example, if I specify that I want 3.14 CPUs, it's a legal specification, but I don't know what it means. Ditto for IndividualPhysicalMemory and IndividualVirtualMemory and IndividualDiskSpace.
Without checking the spec, I guess this is an artefact how ranges are given in JSDL - to be able to use one Range type for all sorts of resources, we decide to use xsd:double as this includes integers.
So you may want to specify 3.14 for jsdl:IndividualCPUCount, but the consuming system then may - throw the JSDL doc back at you nagging about silly values, or - accept the document and use 3.0 instead, or - do something else, e.g. cause a kernel panic in the underlying OS. ;-)
You're right: it is because of how ranges are specified.
Let me make the small suggestion that if there is a future version of JSDL, you consider adding a way to specify this in positive integers, so it's harder for people to specify something meaningless.
3) I don't undersatnd IndividualNetworkBandwidth: bandwidth to where? Does this refer just to the local NIC? What if there are multiple NICs? 4) I'm confused how IndividualDiskSpace interacts with the filesystem element. The FileSystem element specifies how much disk space is needed on a particular file system: the IndividualDiskSpace says something about disk space, but not about where the disk space is located. Which disk space is it? What does it mean if I specify a FileSystem and IndividualDiskSpace? 5) I don't understand the difference between IndividualCPUCount and TotalCPUCount. Can I think of it as the number of CPUs on a single node, and the total number needed across all nodes? Or does it mean something different?
Consider the jsdl:Individual* and jsdl:Total* elements together with the jsdl:ResourceCount element. They are used to express a tiled topology. I hope someboody else can step in here and give a more detailed description.
I don't think I understand, so if anyone else can step in, that would be great.
I think Michel is in a sense confirming what you already supposed. jsdl:Individual* are for individual compute resource requirements while jsdl:Total* are used to specify requirements that apply to the entire job. The jsdl:ResourceCount element merely expresses how many compute resources with those requirements are needed for your job. Peter
Thanks! -alain