[ExM Users] [EXTERNAL] Re: Generating Blobs in Swift/T
Justin M Wozniak
wozniak at mcs.anl.gov
Tue Jul 15 12:19:10 CDT 2014
Also, Samuel, if you are still having trouble with blobs you can send us
a C function prototype and we can help with the blob management.
On 07/14/2014 05:13 PM, Tim Armstrong wrote:
> Hi Samuel,
>
> 1. We have floor, ceil and round in the math library depending on what
> rounding mode you want.
> 2. I think that having a single reference point for those is a good
> idea. LEAF and WORKER are actually synonyms. You should use WORKER,
> we're deprecating LEAF going forward because it wasn't a particularly
> appropriate name. Thanks for catching the reference in the docs, I
> was able to fix that.
> 3. The 0.6.0 release will happen this week with many improvements. A
> lot of the work focused on major improvements in performance and
> scalability, but there are a number of user-facing improvement, such
> as more and easier ways to integrate user code into the scripts. We
> don't have a public roadmap at this stage: we're working on an
> improved web presence for Swift/T at the moment. Maybe we can get in
> touch with you off-list to talk a bit more?
>
> - Tim
>
>
> On Mon, Jul 14, 2014 at 4:42 PM, Knight, Samuel <sknigh at sandia.gov
> <mailto:sknigh at sandia.gov>> wrote:
>
> Thanks for the speedy response.
> We are currently building 0.5.0 from source.
>
> I have three additional questions;
>
> 1. Is there a float -> int function? I crating a workaround by
> casting float -> string -> (parse on decimal) string -> int.
> It is wasteful, and it only works when there is no exponential
> component.
> 2. Is there a single, comprehensive place to read about the '@'
> directives? For example, I cannot determine the difference
> between '@dispatch=WORKER' and '@dispatch=LEAF' from the
> documentation I have found.
> 3. Is a roadmap posted online? It is relevant to my project to
> know about this programming-model's direction. It would be
> particularly helpful to know when 0.6.0 and 1.0 are planned
> for release and what will be added to the implementation.
>
> Thank You,
> Samuel Knight
>
> From: Tim Armstrong <tim.g.armstrong at gmail.com
> <mailto:tim.g.armstrong at gmail.com>>
> Date: Monday, July 14, 2014 at 2:08 PM
> To: Justin M Wozniak <wozniak at mcs.anl.gov
> <mailto:wozniak at mcs.anl.gov>>
> Cc: "exm-user at lists.mcs.anl.gov
> <mailto:exm-user at lists.mcs.anl.gov>" <exm-user at lists.mcs.anl.gov
> <mailto:exm-user at lists.mcs.anl.gov>>
> Subject: [EXTERNAL] Re: [ExM Users] Generating Blobs in Swift/T
>
> I just wanted to add that if you built the release from source you
> can safely comment out the offending line (line 2178 of
> tcl-adlb.c, I believe, if you are using the exm-0.5.0 release).
> As Justin said, this made it into the release on accident and
> doesn't have any useful purpose.
>
> Regards,
> Tim
>
>
> On Mon, Jul 14, 2014 at 4:05 PM, Justin M Wozniak
> <wozniak at mcs.anl.gov <mailto:wozniak at mcs.anl.gov>> wrote:
>
> Hi
>
> Sorry- that message is a debugging line that unfortunately
> made it into the release. It is already removed from our
> trunk and will not be in the next release- you can just remove
> it from your source.
>
> I will fix the blob doc issue now but feel free to post any
> additional questions here in the meantime...
>
> Justin
>
>
> On 07/14/2014 03:52 PM, Knight, Samuel wrote:
>> Hello,
>>
>> I am writing a program in Swift/T that generates blob objects
>> inside a leaf function. Binary data is generated with a
>> Swig-wrapped C function, and the blob construct is produced
>> by making a list out of the pointer and length in the Tcl
>> wrapper.
>>
>> Here is a sample from my Tcl script:
>>
>> proc c_initVect { s o } {
>> set len [ expr $s * [blobutils_sizeof_int32] ]
>> set ptr [ blobutils_malloc $len ]
>> initVect [blobutils_cast_to_int_ptr $ptr] $s $o # C
>> leaf function
>>
>> return [ list [ blobutils_cast_to_int $ptr] $len ] #
>> creating the blob
>> }
>>
>> When I run the program with this snippet, my output fills
>> with 'uncache_blob' messages.
>>
>> Here is an example:
>> uncache_blob: 67376368 4000 3uncache_blob: 67380384 4000 4
>> Which is the output from a program that generates 2 blobs
>> with the function above.
>>
>> The output is automatically generated by the runtime, and I
>> have no control over when blobs are uncached.
>>
>> I've traced that output to ADLB_Local_Blob_Free_Cmd function
>> in src/tcl/adlb/tcl-adlb.c
>>
>> For programs that allocate a large number of blobs, the
>> output from the runtime becomes overwhelming, and I am
>> starting to think my snippet is generating blobs incorrectly.
>> So far, the only example I can find that generates blobs that
>> are returned to Swift/T is a the fortran example from the
>> leaf functions guide (Section 3.4
>> www.mcs.anl.gov/exm/local/guides/leaf.html
>> <http://www.mcs.anl.gov/exm/local/guides/leaf.html>). There
>> is a promising link in Section 3.3.3 of the leaf guide that
>> explains blobs, but when I click on it I get a 403 error.
>>
>> Is anyone aware of additional examples or tutorials that
>> explain how to generate and manage blobs in Swift/T.
>>
>> Thank you,
>> Samuel Knight
>>
>>
>> _______________________________________________
>> ExM-user mailing list
>> ExM-user at lists.mcs.anl.gov <mailto:ExM-user at lists.mcs.anl.gov>https://lists.mcs.anl.gov/mailman/listinfo/exm-user
>
> --
> Justin M Wozniak
>
>
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>
>
--
Justin M Wozniak
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