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✨ File Manager Magic · Hostinger Optimized ✨
3 Jsz*SchedulerUtils.__init__..css|]}tt||fVqdS)N)r(r))r*r,rrrr-Ls)dict_dict_schedcfg2schedconstitems_dict_schedcfg2numvalues_dict_num2schedconst)r rrrrHszSchedulerUtils.__init__cCs |jj|S)N)r1get)r str_schedulerrrrsched_cfg_to_numNszSchedulerUtils.sched_cfg_to_numcCs |jj|S)N)r3r4)r r rrrsched_num_to_constRsz!SchedulerUtils.sched_num_to_constcCs tj|S)N)r)sched_getscheduler)r pidrrr get_schedulerUszSchedulerUtils.get_schedulercCstj||tj|dS)N)r)sched_setscheduler sched_param)r r9schedpriorrr set_schedulerXszSchedulerUtils.set_schedulercCs tj|S)N)r)sched_getaffinity)r r9rrr get_affinity[szSchedulerUtils.get_affinitycCstj||dS)N)r)sched_setaffinity)r r9r rrr set_affinity^szSchedulerUtils.set_affinitycCs tj|jS)N)r)sched_getparamsched_priority)r r9rrr get_priorityaszSchedulerUtils.get_prioritycCs tj|S)N)r)sched_get_priority_min)r r=rrrget_priority_mindszSchedulerUtils.get_priority_mincCs tj|S)N)r)sched_get_priority_max)r r=rrrget_priority_maxgszSchedulerUtils.get_priority_maxN)rrr__doc__r/rr6r7r:r?rArCrFrHrJrrrrr;s rc@sPeZdZdZddZddZddZdd Zd d Zd d Z ddZ ddZ dS)SchedulerUtilsSchedutilszE Class encapsulating scheduler implementation in schedutils module cCs8tdd|jjD|_tdd|jjD|_dS)Ncss |]\}}|tt|fVqdS)N)r( schedutils)r*r+r,rrrr-psz4SchedulerUtilsSchedutils.__init__..css|]}tt||fVqdS)N)r(rM)r*r,rrrr-rs)r.r/r0r1r2r3)r rrrrnsz!SchedulerUtilsSchedutils.__init__cCs tj|S)N)rMr:)r r9rrrr:tsz&SchedulerUtilsSchedutils.get_schedulercCstj|||dS)N)rMr?)r r9r=r>rrrr?wsz&SchedulerUtilsSchedutils.set_schedulercCs tj|S)N)rMrA)r r9rrrrAzsz%SchedulerUtilsSchedutils.get_affinitycCstj||dS)N)rMrC)r r9r rrrrC}sz%SchedulerUtilsSchedutils.set_affinitycCs tj|S)N)rMrF)r r9rrrrFsz%SchedulerUtilsSchedutils.get_prioritycCs tj|S)N)rMrH)r r=rrrrHsz)SchedulerUtilsSchedutils.get_priority_mincCs tj|S)N)rMrJ)r r=rrrrJsz)SchedulerUtilsSchedutils.get_priority_maxN) rrrrKrr:r?rArCrFrHrJrrrrrLjsrLcseZdZdZfddZddZddZdd Zed d Z d d Z ddZ ddZ ddZ ddZddZddZddZddZddZdd!d"Zd#d$Zd%d&Zd'd(Zdd)d*Zd+d,Zd-d.Zd/d0Zd1d2Zd3d4Zd5d6Zd7d8Zd9d:Z d;d<Z!d=d>Z"dd?d@Z#dAdBZ$dCdDZ%fdEdFZ&dGdHZ'dIdJZ(dKdLZ)e*j+ffdMdN Z,dOdPZ-dQdRZ.fdSdTZ/dUdVZ0dWdXZ1dYdZZ2e3d[d d\d]d^Z4e3d_d d\d`daZ5e3dbd d\dcddZ6e3ded d\dfdgZ7e3dhd d\didjZ8e3dkd d\dldmZ9dndoZ:dpdqZ;drdsZdxdyZ?dzd{Z@d|d}ZAd~dZBddZCddZDddZEddZFe3dd ddddZGddZHddZIdddZJeKdddZLeMdddZNeKdddZOeMdddZPeKdddZQeMdddZReKdddZSeMdddZTeKdddZUeMdddZVeKdddZWeMdddZXeKdddZYeMdddZZeKdddZ[eMdddZ\eKdddZ]eMdddZ^eKddd„Z_eMdddĄZ`ZaS)SchedulerPlugina]- `scheduler`:: Allows tuning of scheduling priorities, process/thread/IRQ affinities, and CPU isolation. + To prevent processes/threads/IRQs from using certain CPUs, use the [option]`isolated_cores` option. It changes process/thread affinities, IRQs affinities and it sets `default_smp_affinity` for IRQs. The CPU affinity mask is adjusted for all processes and threads matching [option]`ps_whitelist` option subject to success of the `sched_setaffinity()` system call. The default setting of the [option]`ps_whitelist` regular expression is `.*` to match all processes and thread names. To exclude certain processes and threads use [option]`ps_blacklist` option. The value of this option is also interpreted as a regular expression and process/thread names (`ps -eo cmd`) are matched against that expression. Profile rollback allows all matching processes and threads to run on all CPUs and restores the IRQ settings prior to the profile application. + Multiple regular expressions for [option]`ps_whitelist` and [option]`ps_blacklist` options are allowed and separated by `;`. Quoted semicolon `\;` is taken literally. + .Isolate CPUs 2-4 ==== ---- [scheduler] isolated_cores=2-4 ps_blacklist=.*pmd.*;.*PMD.*;^DPDK;.*qemu-kvm.* ---- Isolate CPUs 2-4 while ignoring processes and threads matching `ps_blacklist` regular expressions. ==== The [option]`irq_process` option controls whether the scheduler plugin applies the `isolated_cores` parameter to IRQ affinities. The default value is `true`, which means that the scheduler plugin will move all possible IRQs away from the isolated cores. When `irq_process` is set to `false`, the plugin will not change any IRQ affinities. ==== The [option]`default_irq_smp_affinity` option controls the values *TuneD* writes to `/proc/irq/default_smp_affinity`. The file specifies default affinity mask that applies to all non-active IRQs. Once an IRQ is allocated/activated its affinity bitmask will be set to the default mask. + The following values are supported: + -- `calc`:: Content of `/proc/irq/default_smp_affinity` will be calculated from the `isolated_cores` parameter. Non-isolated cores are calculated as an inversion of the `isolated_cores`. Then the intersection of the non-isolated cores and the previous content of `/proc/irq/default_smp_affinity` is written to `/proc/irq/default_smp_affinity`. If the intersection is an empty set, then just the non-isolated cores are written to `/proc/irq/default_smp_affinity`. This behavior is the default if the parameter `default_irq_smp_affinity` is omitted. `ignore`:: *TuneD* will not touch `/proc/irq/default_smp_affinity`. explicit cpulist:: The cpulist (such as 1,3-4) is unpacked and written directly to `/proc/irq/default_smp_affinity`. -- + .An explicit CPU list to set the default IRQ smp affinity to CPUs 0 and 2 ==== ---- [scheduler] isolated_cores=1,3 default_irq_smp_affinity=0,2 ---- ==== To adjust scheduling policy, priority and affinity for a group of processes/threads, use the following syntax. + [subs="+quotes,+macros"] ---- group.__groupname__=__rule_prio__:__sched__:__prio__:__affinity__:__regex__ ---- + where `__rule_prio__` defines internal *TuneD* priority of the rule. Rules are sorted based on priority. This is needed for inheritence to be able to reorder previously defined rules. Equal `__rule_prio__` rules should be processed in the order they were defined. However, this is Python interpreter dependant. To disable an inherited rule for `__groupname__` use: + [subs="+quotes,+macros"] ---- group.__groupname__= ---- + `__sched__` must be one of: *`f`* for FIFO, *`b`* for batch, *`r`* for round robin, *`o`* for other, *`*`* do not change. + `__affinity__` is CPU affinity in hexadecimal. Use `*` for no change. + `__prio__` scheduling priority (see `chrt -m`). + `__regex__` is Python regular expression. It is matched against the output of + [subs="+quotes,+macros"] ---- ps -eo cmd ---- + Any given process name may match more than one group. In such a case, the priority and scheduling policy are taken from the last matching `__regex__`. + .Setting scheduling policy and priorities to kernel threads and watchdog ==== ---- [scheduler] group.kthreads=0:*:1:*:\[.*\]$ group.watchdog=0:f:99:*:\[watchdog.*\] ---- ==== + The scheduler plug-in uses perf event loop to catch newly created processes. By default it listens to `perf.RECORD_COMM` and `perf.RECORD_EXIT` events. By setting [option]`perf_process_fork` option to `true`, `perf.RECORD_FORK` events will be also listened to. In other words, child processes created by the `fork()` system call will be processed. Since child processes inherit CPU affinity from their parents, the scheduler plug-in usually does not need to explicitly process these events. As processing perf events can pose a significant CPU overhead, the [option]`perf_process_fork` option parameter is set to `false` by default. Due to this, child processes are not processed by the scheduler plug-in. + The CPU overhead of the scheduler plugin can be mitigated by using the scheduler [option]`runtime` option and setting it to `0`. This will completely disable the dynamic scheduler functionality and the perf events will not be monitored and acted upon. The disadvantage ot this approach is the procees/thread tuning will be done only at profile application. + .Disabling the scheduler dynamic functionality ==== ---- [scheduler] runtime=0 isolated_cores=1,3 ---- ==== + NOTE: For perf events, memory mapped buffer is used. Under heavy load the buffer may overflow. In such cases the `scheduler` plug-in may start missing events and failing to process some newly created processes. Increasing the buffer size may help. The buffer size can be set with the [option]`perf_mmap_pages` option. The value of this parameter has to expressed in powers of 2. If it is not the power of 2, the nearest higher power of 2 value is calculated from it and this calculated value used. If the [option]`perf_mmap_pages` option is omitted, the default kernel value is used. + The scheduler plug-in supports process/thread confinement using cgroups v1. + [option]`cgroup_mount_point` option specifies the path to mount the cgroup filesystem or where *TuneD* expects it to be mounted. If unset, `/sys/fs/cgroup/cpuset` is expected. + If [option]`cgroup_groups_init` option is set to `1` *TuneD* will create (and remove) all cgroups defined with the `cgroup*` options. This is the default behavior. If it is set to `0` the cgroups need to be preset by other means. + If [option]`cgroup_mount_point_init` option is set to `1`, *TuneD* will create (and remove) the cgroup mountpoint. It implies `cgroup_groups_init = 1`. If set to `0` the cgroups mount point needs to be preset by other means. This is the default behavior. + The [option]`cgroup_for_isolated_cores` option is the cgroup name used for the [option]`isolated_cores` option functionality. For example, if a system has 4 CPUs, `isolated_cores=1` means that all processes/threads will be moved to CPUs 0,2-3. The scheduler plug-in will isolate the specified core by writing the calculated CPU affinity to the `cpuset.cpus` control file of the specified cgroup and move all the matching processes/threads to this group. If this option is unset, classic cpuset affinity using `sched_setaffinity()` will be used. + [option]`cgroup.__cgroup_name__` option defines affinities for arbitrary cgroups. Even hierarchic cgroups can be used, but the hieararchy needs to be specified in the correct order. Also *TuneD* does not do any sanity checks here, with the exception that it forces the cgroup to be under [option]`cgroup_mount_point`. + The syntax of the scheduler option starting with `group.` has been augmented to use `cgroup.__cgroup_name__` instead of the hexadecimal `__affinity__`. The matching processes will be moved to the cgroup `__cgroup_name__`. It is also possible to use cgroups which have not been defined by the [option]`cgroup.` option as described above, i.e. cgroups not managed by *TuneD*. + All cgroup names are sanitized by replacing all all dots (`.`) with slashes (`/`). This is to prevent the plug-in from writing outside [option]`cgroup_mount_point`. + .Using cgroups v1 with the scheduler plug-in ==== ---- [scheduler] cgroup_mount_point=/sys/fs/cgroup/cpuset cgroup_mount_point_init=1 cgroup_groups_init=1 cgroup_for_isolated_cores=group cgroup.group1=2 cgroup.group2=0,2 group.ksoftirqd=0:f:2:cgroup.group1:ksoftirqd.* ps_blacklist=ksoftirqd.*;rcuc.*;rcub.*;ktimersoftd.* isolated_cores=1 ---- Cgroup `group1` has the affinity set to CPU 2 and the cgroup `group2` to CPUs 0,2. Given a 4 CPU setup, the [option]`isolated_cores=1` option causes all processes/threads to be moved to CPU cores 0,2-3. Processes/threads that are blacklisted by the [option]`ps_blacklist` regular expression will not be moved. The scheduler plug-in will isolate the specified core by writing the CPU affinity 0,2-3 to the `cpuset.cpus` control file of the `group` and move all the matching processes/threads to this cgroup. ==== Option [option]`cgroup_ps_blacklist` allows excluding processes which belong to the blacklisted cgroups. The regular expression specified by this option is matched against cgroup hierarchies from `/proc/PID/cgroups`. Cgroups v1 hierarchies from `/proc/PID/cgroups` are separated by commas ',' prior to regular expression matching. The following is an example of content against which the regular expression is matched against: `10:hugetlb:/,9:perf_event:/,8:blkio:/` + Multiple regular expressions can be separated by semicolon ';'. The semicolon represents a logical 'or' operator. + .Cgroup-based exclusion of processes from the scheduler ==== ---- [scheduler] isolated_cores=1 cgroup_ps_blacklist=:/daemons\b ---- The scheduler plug-in will move all processes away from core 1 except processes which belong to cgroup '/daemons'. The '\b' is a regular expression metacharacter that matches a word boundary. ---- [scheduler] isolated_cores=1 cgroup_ps_blacklist=\b8:blkio: ---- The scheduler plug-in will exclude all processes which belong to a cgroup with hierarchy-ID 8 and controller-list blkio. ==== Recent kernels moved some `sched_` and `numa_balancing_` kernel run-time parameters from `/proc/sys/kernel`, managed by the `sysctl` utility, to `debugfs`, typically mounted under `/sys/kernel/debug`. TuneD provides an abstraction mechanism for the following parameters via the scheduler plug-in: [option]`sched_min_granularity_ns`, [option]`sched_latency_ns`, [option]`sched_wakeup_granularity_ns`, [option]`sched_tunable_scaling`, [option]`sched_migration_cost_ns`, [option]`sched_nr_migrate`, [option]`numa_balancing_scan_delay_ms`, [option]`numa_balancing_scan_period_min_ms`, [option]`numa_balancing_scan_period_max_ms` and [option]`numa_balancing_scan_size_mb`. Based on the kernel used, TuneD will write the specified value to the correct location. + .Set tasks' "cache hot" value for migration decisions. ==== ---- [scheduler] sched_migration_cost_ns=500000 ---- On the old kernels, this is equivalent to: ---- [sysctl] kernel.sched_migration_cost_ns=500000 ---- that is, value `500000` will be written to `/proc/sys/kernel/sched_migration_cost_ns`. 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