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<div>Hello,</div>
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<div>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.</div>
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<div>Here is a sample from my Tcl script:</div>
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<div>proc c_initVect { s o } {</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>set len [ expr $s * [blobutils_sizeof_int32] ]</div>
<div> set ptr [ blobutils_malloc $len ]</div>
<div> initVect [blobutils_cast_to_int_ptr $ptr] $s $o # C leaf function</div>
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<div> return [ list [ blobutils_cast_to_int $ptr] $len ] # creating the blob</div>
<div>}</div>
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<div>When I run the program with this snippet, my output fills with 'uncache_blob' messages.</div>
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<div>Here is an example:</div>
<div>uncache_blob: 67376368 4000 3uncache_blob: 67380384 4000 4</div>
<div>Which is the output from a program that generates 2 blobs with the function above.</div>
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<div>The output is automatically generated by the runtime, and I have no control over when blobs are uncached.</div>
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<div>I've traced that output to ADLB_Local_Blob_Free_Cmd function in src/tcl/adlb/tcl-adlb.c</div>
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<div>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). 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.</div>
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<div>Is anyone aware of additional examples or tutorials that explain how to generate and manage blobs in Swift/T.</div>
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<div>Thank you,</div>
<div>Samuel Knight</div>
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