Re: [sage-combinat-devel] Re: combinat.math.washington.edu
Hi William, I would like to launch a big computation now on combinat. When I logged on, the scratch partition seemed out of service. How should I run the computations (in fact I have some c programs and Sage programs I would like to run)? I also have an SMC project for this in case combinat has been SMC-ified yet. Thanks! Anne On 1/7/15 11:56 AM, William Stein wrote: > On Tue, Jan 6, 2015 at 1:40 PM, William Stein wrote: >> On Sat, Jan 3, 2015 at 8:23 PM, William Stein wrote: >>> Hi, >>> >>> The computer combinat.math.washington.edu is down... again. Sort of. >>> It responds to ping requests, but I can't ssh in. >> >> A minor update: there are notifications about physical hardware >> failures on the front of the machine, so it may be longer than >> expected until combinat is running again. > > Hi, > > combinat.math.washington.edu is working again now as before. One > local scratch disk seems to have failed. However, everything else > seems to be working fine. > > I won't be messing with it for the next week or two, but plan to > SMC-ify it at some point (I'll post in advance). In the meantime, I > hope people will log in and use it! 64 cores. 192GB RAM. > > William -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
[sage-combinat-devel] Re: combinat.math.washington.edu
On Tue, Jan 6, 2015 at 1:40 PM, William Stein wrote: > On Sat, Jan 3, 2015 at 8:23 PM, William Stein wrote: >> Hi, >> >> The computer combinat.math.washington.edu is down... again. Sort of. >> It responds to ping requests, but I can't ssh in. > > A minor update: there are notifications about physical hardware > failures on the front of the machine, so it may be longer than > expected until combinat is running again. Hi, combinat.math.washington.edu is working again now as before. One local scratch disk seems to have failed. However, everything else seems to be working fine. I won't be messing with it for the next week or two, but plan to SMC-ify it at some point (I'll post in advance). In the meantime, I hope people will log in and use it! 64 cores. 192GB RAM. William -- William Stein Professor of Mathematics University of Washington http://wstein.org -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
[sage-combinat-devel] Re: combinat.math.washington.edu
On Sat, Jan 3, 2015 at 8:23 PM, William Stein wrote: > Hi, > > The computer combinat.math.washington.edu is down... again. Sort of. > It responds to ping requests, but I can't ssh in. A minor update: there are notifications about physical hardware failures on the front of the machine, so it may be longer than expected until combinat is running again. william -- William Stein Professor of Mathematics University of Washington http://wstein.org -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
Re: [sage-combinat-devel] Re: combinat.math.washington.edu
On Sun, Jan 4, 2015 at 2:06 PM, Andrew wrote: > Hi William, > > Is it possible to access beta code and git branches from SMC? Yes -- one can do 100% full sage development on your own personal copy of Sage using SMC. And it's all snapshotted and backed up offsite. William > > Last Year I was running calculations on the combinat server using some > private git branches. Once I have brushed up the code a little I'd like to > start these again. I can certainly push this code to trac but it will be a > while before it is ready for review as I'll have a busy year. > > Andrew > > > On Sunday, 4 January 2015 15:23:56 UTC+11, William Stein wrote: >> >> Hi, >> >> The computer combinat.math.washington.edu is down... again. Sort of. >> It responds to ping requests, but I can't ssh in. >> >> I suspect that not a lot of people are actively using it lately, since >> this is the second time it has gone down for over a week in the last 3 >> months, and nobody (except my student Hao Chen), seems to have >> noticed. >> >> I'm considering doing the following. I'll shutdown combinat >> completely, reformat the disk, and set it up as a node of the >> cloud.sagemath.com (SMC). It'll still have the amazing 64 cores and >> huge (192GB) RAM. However, instead of login in directly to it, people >> can email me to request that I move a particular SMC project to >> combinat. It will then have access to expanded compute resources. >> The advantage of this, is that it is much easier for me to maintain. >> In particular, SMC has automated scripts to take care of using cgroups >> to explicitly limit usage of compute resources by a given project, I >> have extensive monitoring code in place so I know when things go down, >> and I everything runs in virtual machines, so when there are problems >> I can easily fix them in a few minutes remotely. Also, it's much >> easier to grant fair usage to projects.As it is now with default >> linux on combinat, basically any user can just bring down the computer >> by using too much memory/disk/whatever, which is probably what >> happened in this case (I don't know). >> >> Thoughts? >> >> Obviously, this may be a bit slower and the max memory will be less >> (as things are in a VM) for specific research-level computations. >> However, a working computer is way better than a regularly-crashing >> computer, in my opinion.Also, given the weeks of downtime that >> nobody (except Hao) notices, maybe people aren't using combinat at all >> anyways, due to it being only a remote linux box. Personally, I >> think SMC makes using remote Linux boxes much easier. >> >> -- William >> >> -- >> William Stein >> Professor of Mathematics >> University of Washington >> http://wstein.org > > -- > You received this message because you are subscribed to the Google Groups > "sage-combinat-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-combinat-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-combinat-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-combinat-devel. > For more options, visit https://groups.google.com/d/optout. -- William Stein Professor of Mathematics University of Washington http://wstein.org -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
[sage-combinat-devel] Re: combinat.math.washington.edu
Hi William, Is it possible to access beta code and git branches from SMC? Last Year I was running calculations on the combinat server using some private git branches. Once I have brushed up the code a little I'd like to start these again. I can certainly push this code to trac but it will be a while before it is ready for review as I'll have a busy year. Andrew On Sunday, 4 January 2015 15:23:56 UTC+11, William Stein wrote: > > Hi, > > The computer combinat.math.washington.edu is down... again. Sort of. > It responds to ping requests, but I can't ssh in. > > I suspect that not a lot of people are actively using it lately, since > this is the second time it has gone down for over a week in the last 3 > months, and nobody (except my student Hao Chen), seems to have > noticed. > > I'm considering doing the following. I'll shutdown combinat > completely, reformat the disk, and set it up as a node of the > cloud.sagemath.com (SMC). It'll still have the amazing 64 cores and > huge (192GB) RAM. However, instead of login in directly to it, people > can email me to request that I move a particular SMC project to > combinat. It will then have access to expanded compute resources. > The advantage of this, is that it is much easier for me to maintain. > In particular, SMC has automated scripts to take care of using cgroups > to explicitly limit usage of compute resources by a given project, I > have extensive monitoring code in place so I know when things go down, > and I everything runs in virtual machines, so when there are problems > I can easily fix them in a few minutes remotely. Also, it's much > easier to grant fair usage to projects.As it is now with default > linux on combinat, basically any user can just bring down the computer > by using too much memory/disk/whatever, which is probably what > happened in this case (I don't know). > > Thoughts? > > Obviously, this may be a bit slower and the max memory will be less > (as things are in a VM) for specific research-level computations. > However, a working computer is way better than a regularly-crashing > computer, in my opinion.Also, given the weeks of downtime that > nobody (except Hao) notices, maybe people aren't using combinat at all > anyways, due to it being only a remote linux box. Personally, I > think SMC makes using remote Linux boxes much easier. > > -- William > > -- > William Stein > Professor of Mathematics > University of Washington > http://wstein.org > -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
