<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">New code can (and absolutely should) use it right away, PetscDeviceContext has been fully functional since its merger. Remember though that it works on a “principled parallelism” model; the caller is responsible for proper serialization.</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">Existing code? Not so much. In broad strokes the following sections need support before parallelism can be achieved from user-code:</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">1. Vec - WIP (feature complete, now in bug-fixing stage)</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">2. PetscSF - TODO</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">3. Mat - TODO</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">4. KSP/PC - TODO</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">Seeing as each MR thus far for this has taken me roughly 3-4 months to merge, and with the later sections requiring enormous rewrites and API changes I don’t expect this to be finished for at least 2 years… Once the Vec MR is merged you could theoretically run with -device_context_stream_type default_blocking and achieve “asynchronous” compute but nothing would work properly as every other part of petsc expects to be synchronous.</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Menlo-Regular; font-size: 11px;" class="">That being said I would be happy to give a demo to people on how they can integrate PetscDeviceContext into their code on the next developers meeting. It would go a long way to cutting down the timeline.</span><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 15, 2022, at 02:02, Stefano Zampini <<a href="mailto:stefano.zampini@gmail.com" class="">stefano.zampini@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class="">Jacob</div><div class=""><br class=""></div><div class="">what is the current status of the async support in PETSc?</div><div class="">Can you summarize here? Is there any documentation available?</div><div class=""><br class=""></div><div class="">Thanks</div>-- <br class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Stefano</div></div></div>
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