Lennart Poettering <mzerqung <at> 0pointer.de> writes: > ... I would like to verify the systemd's parallelism (or should we say concurrency in case of systemd ?) claim. Any parallelization possible to achieve thru configuration of service files ? What it would look like ? Let me take a shot at 2 examples of service files below. Are they correct setup-wise ? Will both examples be executed sequentially only ? 1. main-service-1.service: [Unit] Description=Main service 1 Requires= ... sub-service-1.service sub-service-2.service After= ... sub-service-1.service sub-service-2.service ... [Service] Type=forking <---------------------- any other type too ? ExecStartPre= ExecStartPre= ExecStart= ExecStart= /usr/sbin/some-service ExecStartPost= ExecStartPost= ... sub-service-1.service: [Unit] Description=Sub service 1 ... [Service] ... sub-service-2.service: [Unit] Description=Sub service 2 ... [Service] ... 2. main-service-2.service: [Unit] Description=Main service 2 After= ... ... [Service] Type=forking <---------------------- any other type too ? ExecStartPre= sub-service-1.service ExecStartPre= sub-service-2.service ExecStart= ExecStart= /usr/sbin/some-service ExecStartPost= ExecStartPost= ... sub-service-1.service: [Unit] Description=Sub service 1 ... [Service] ... sub-service-2.service: [Unit] Description=Sub service 2 ... [Service] ... What if sysadmin wants to execute them in parallel because she knows they can be executed this way (no conflict and no races) ? How, if by definition, systemd executes them sequentially only ? Can they be grouped and execution-parallelized in the whole service file, or at least in subgroups Pre-, regular, and Post- ? The /etc/init.d/nfs under current SysV init system can start the main service and include calling sub-services (each of whom is a separate service as well). Yes, they are executed sequentially. Can that be done under systemd as well ? Are the examples given above good for that ? If yes, they would be examples of a sequential execution as under SysV init ? So, where would be the promised parallelism in there, in the way the main and sub services are executed ? Can you give us a working example of a services setup (or something else) in systemd where execution-parallelism would be present or at least theoretically exploitable ? JB -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
