Hi Michael, We typically have one in Hamburg at some stage in the year - which would be near you; the ESC minutes have details on all of those as they come up (posted to this list weekly). We also have a larger hackfest in Brussels before or after FOSDEM - which is an excellent conference to attend anyway =)
Yes, that’s very close :) Thanks! I can see there is also a tentative LibreOffice Conference announced in the wiki<https://wiki.documentfoundation.org/Events/2019>. Thanks for the FOSDEM recommendation! Only in very recent times (the last generation) has typical GPU hardware become capable of running multiple kernels simultaneously and/or pre-empting running kernels. This leads to amusing situations - whereby moving the mouse while a long running sheet calculates would simply not be able to render - until a Windows / TDR was triggered. We had to come up with heuristics to break down the CL workload into bite-sized chunks to avoid this. More modern hardware doesn't have this issue though. Interesting stuff :) And yes, we use CL when we think it makes sense - based on weights and complexity of the relevant formulae. Otherwise we use the old interpreter (or now its threaded variant - again depending on complexity). I like the practical approach using weights and formula complexity. We currently use a full big-step cost semantics for the formula language to estimate cost in the static partitioning algorithm. Unfortunately, assigning costs also results in quite a slowdown in the partitioning algorithm. As one of my colleagues said though, you can think of the process as compiling the spread- sheet into a partition that can scheduled to run on a set of multicore processors. The threaded variant you refer to is the one from the slides right? As I understand, the interpreter is not fully parallel but runs cell arrays/formula groups in parallel. Mvh/Best regards, Alexander Asp Bock, PhD student Computer Science Department<https://computerscience.wikit.itu.dk/> IT University of Copenhagen<http://en.itu.dk/> On 18 Sep 2018, at 11.55, Michael Meeks <michael.me...@collabora.com<mailto:michael.me...@collabora.com>> wrote: Hi Alexander, On 18/09/18 10:26, Alexander Bock wrote: I would be delighted to join one of the hackfests if time allows. Is there a schedule available somewhere? We typically have one in Hamburg at some stage in the year - which would be near you; the ESC minutes have details on all of those as they come up (posted to this list weekly). We also have a larger hackfest in Brussels before or after FOSDEM - which is an excellent conference to attend anyway =) I know of EUSPRIG as well and their horror stories <http://eusprig.org/horror-stories.htm> Some good stories there =) Thanks for the list of conferences. Do you run any of the generated OpenCL kernels in parallel or do you run a normal sequential recalculation and call the kernel code as necessary? I would suspect the latter given the information you have provided so far :) Only in very recent times (the last generation) has typical GPU hardware become capable of running multiple kernels simultaneously and/or pre-empting running kernels. This leads to amusing situations - whereby moving the mouse while a long running sheet calculates would simply not be able to render - until a Windows / TDR was triggered. We had to come up with heuristics to break down the CL workload into bite-sized chunks to avoid this. More modern hardware doesn't have this issue though. And yes, we use CL when we think it makes sense - based on weights and complexity of the relevant formulae. Otherwise we use the old interpreter (or now its threaded variant - again depending on complexity). HTH, Michael. -- michael.me...@collabora.com<mailto:michael.me...@collabora.com> <><, GM Collabora Productivity Hangout: mejme...@gmail.com<mailto:mejme...@gmail.com>, Skype: mmeeks (M) +44 7795 666 147 - timezone usually UK / Europe
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