When access locality does hold true, such as transposing a large matrix in-place , the excessive disk swapping makes computers non responsive.
On Sun, 4 Dec 2022 at 7:56 AM Raul Miller <rauldmil...@gmail.com> wrote: > These days, a cheap laptop might have 8GB ram. > > Why would 2-3GB ram be a better swap size here than a swap which is at > least as big as main memory? > > (I guess we have write ups with advice about how much swap space is > useful, from back in the days when most machines had significantly > less than 1GB ram, and maybe we have similar write ups from people who > came up with some narrative describing why that advice is still > sometimes useful. But it seems to me that insufficient swap space > would lead to "unable to launch jbreak when J has grabbed too much > memory" issues.) > > Thanks, > > -- > Raul > > On Sat, Dec 3, 2022 at 5:58 PM bill lam <bbill....@gmail.com> wrote: > > > > Setting swap size equal physical ram is reasonable and is the default of > > some OS already. But here the problem is still too large to mitigate > > excessive disk swapping. Setting swap size to 2 or 3 GB is more > appropriate. > > > > That said, the issue is very serious on spinning hard disk but is > > acceptable when using ssd. > > > > > > On Sat, Dec 3, 2022, 11:10 PM Raul Miller <rauldmil...@gmail.com> wrote: > > > > > One approach here would be to have launched task manager before the > > > problem arises. > > > > > > If task manager is running and J is pre-selected within task manager, > > > selecting task manager (using the mouse or alt-tab) then hitting the > > > delete key (and then confirming on the resulting popup -- probably > > > hitting y or enter) should work. > > > > > > That said, I think you should seriously consider setting the swap file > > > size on this laptop to be as large as the amount of physical ram you > > > have. (Or, double that, if you have enough free space.) > > > > > > I hope this helps, > > > > > > -- > > > Raul > > > > > > On Sat, Dec 3, 2022 at 9:10 AM Richard Donovan <rsdono...@hotmail.com> > > > wrote: > > > > > > > > Yes that is exactly what happens to me. I need a global switch to > throw > > > an interrupt if more than x cpu seconds elapses without termination. > Or, > > > when local storage is more than y% used. Preferably this could be > toggled > > > and set from an ide menu or from profile so I wouldn’t have to (forget > to!) > > > set it every time. There is nothing worse than having to reboot and > loses > > > loads of work! > > > > > > > > > On 3 Dec 2022, at 12:23, bill lam <bbill....@gmail.com> wrote: > > > > > > > > > > Sometimes this happens to me too when the process allocated far > more > > > memory > > > > > than physical ram available. The disk swapping for virtual memory > > > prevented > > > > > any mouse click or keyboard response. The problem only way to stop > it > > > is to > > > > > long pressing the power button. > > > > > > > > > > Therefore sometimes I want to set a lower limit of virtual memory. > It > > > is > > > > > better to trigger out of memory crash than waiting indefinitely and > > > finally > > > > > power off the computer. > > > > > > > > > >> On Sat, 3 Dec 2022 at 8:14 PM Richard Donovan < > rsdono...@hotmail.com> > > > wrote: > > > > >> > > > > >> Elijah; > > > > >> > > > > >> Most times I can’t even get in to task manager. As this problem > > > crashes > > > > >> the whole system and causes the need for a reboot, I am obviously > > > loathe to > > > > >> try to recreate it!ick Next time it happens I wrepost with more > info! > > > > >> > > > > >> Thanks > > > > >> > > > > >> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> > for > > > Windows > > > > >> > > > > >> ________________________________ > > > > >> From: Programming <programming-boun...@forums.jsoftware.com> on > > > behalf of > > > > >> Elijah Stone <elro...@elronnd.net> > > > > >> Sent: Friday, December 2, 2022 11:19:58 AM > > > > >> To: J Programming <programm...@jsoftware.com> > > > > >> Subject: Re: [Jprogramming] Avoiding J crash > > > > >> > > > > >> Rebooting is a bit drastic; can you not kill j from task manager? > > > > >> > > > > >> Beyond that, break _should_ work. I can look into making it a bit > > > more > > > > >> responsive for long array operations, but am curious to know what > > > > >> specifically > > > > >> has caused you trouble. > > > > >> > > > > >>> On Fri, 2 Dec 2022, Richard Donovan wrote: > > > > >>> > > > > >>> Hi! > > > > >>> > > > > >>> Is there any way to avoid the situation whereby by error I put J > > > into > > > > >> an infinite loop from which the only recovery is to reboot my > Windows > > > > >> laptop? > > > > >>> > > > > >>> I guess that my erroneous routine is locking the CPU to such a > such > > > an > > > > >> extent that I can’t even get to run Jbreak. > > > > >>> > > > > >>> I quite often receive a recoverable situation when a limit has > been > > > > >> exceeded but if I get the infinite loop situation I have lost my > > > entire > > > > >> session and have to start again. > > > > >>> > > > > >>> I really need a global setting which limits the amount of cpu > usage > > > and > > > > >> aborts a function before it gets out of hand. > > > > >>> > > > > >>> Thanks, > > > > >>> > > > > >>> Richard > > > > >>> > > > ---------------------------------------------------------------------- > > > > >>> For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > >> > ---------------------------------------------------------------------- > > > > >> For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > >> > ---------------------------------------------------------------------- > > > > >> For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > >> > > > > > > ---------------------------------------------------------------------- > > > > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
