scheduler

i'm trying to run a php script using the heroku scheduler. What command should i put in after the $ in heroku. I keep getting file not found. I have transferred the file i want to run to heroku but not luck with running it with the scheduler. The default PHP buildpack on Heroku does not currently have PHP CLI support , so you can only use it to serve web requests via Apache and not for scripts in worker dynos. However, this is possible if you are using a PHP buildpack that does have CLI support. To test it out, I forked the PHP buildpack , switched out the PHP binary with one that was compiled

I've read in multiple places that Linux's default scheduler is hyperthreading aware on multi-core machines, meaning that if you have a machine with 2 real cores (4 HT), it won't schedule two busy threads onto logical cores in a way that they both run on the same physical cores (which would lead to 2x performance cost in many cases). But when I run stress -c 2 (spawns two threads to run on 100% CPU) on my Intel i5-2520M, it often schedules (and keeps) the two threads onto HT cores 1 and 2, which map to the same physical core . Even if the system is idle otherwise. This also happens with real

I'm studying the Linux Kernel and am trying to figure out how the Round Robin scheduling algorithm works. In the kernel\sched_rt.c file, there's a method called task_tick_rt defined like this: static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued) { update_curr_rt(rq); watchdog(rq, p); /* * RR tasks need a special form of timeslice management. * FIFO tasks have no timeslices. */ if (p->policy != SCHED_RR) return; if (--p->rt.time_slice) return; p->rt.time_slice = DEF_TIMESLICE; /* * Requeue to the end of queue if we are not the only element * on the queue: */ if (p->rt.run

TL;DR : Using linux kernel real time with NO_HZ_FULL I need to isolate a process in order to have deterministic results but /proc/interrupts tell me there is still local timer interrupts (among other). How to disable it? Long version : I want to make sure my program is not being interrupt so I try to use a real time linux kernel. I'm using the real time version of arch linux (linux-rt on AUR) and I modified the configuration of the kernel to selection the following options : CONFIG_NO_HZ_FULL=y CONFIG_NO_HZ_FULL_ALL=y CONFIG_RCU_NOCB_CPU=y CONFIG_RCU_NOCB_CPU_ALL=y then I reboot my computer to

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I am working on a new IO scheduler for the Linux Kernel. I am trying to see if anyone knows of a tool that prints out total number of outstanding IO requests (Disk IO queue) in Linux? I would be working from a terminal. Thank you! Forgive the massive necro here. You actually want iostat -x which will display the extended stats for the device in question since last iostat was run. If you wish to monitor the queue in

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I want to create a cron job that runs every x weeks and on a specific weekdays. for example: run every 2 weeks on midnight every Sunday and Monday. the cron expression is stored for every "plan" and i use ncrontab function in SQL Server 2008 to generate the dates of given cron expression. Is there an expression for it? or even join of several expressions? I've tried to use the following expression, but it always gives