Typo. doesn't hold true On Sun, 4 Dec 2022 at 9:08 AM bill lam <bbill....@gmail.com> wrote:
> 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
