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core: change TasksMax= default for system services to 15%

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As it turns out 512 is max number of tasks per service is hit by too many
applications, hence let's bump it a bit, and make it relative to the system's
maximum number of PIDs. With this change the new default is 15%. At the
kernel's default pids_max value of 32768 this translates to 4915. At machined's
default TasksMax= setting of 16384 this translates to 2457.

Why 15%? Because it sounds like a round number and is close enough to 4096
which I was going for, i.e. an eight-fold increase over the old 512

Summary:

            | on the host | in a container
old default |         512 |           512
new default |        4915 |          2457
This commit is contained in:
Lennart Poettering 2016-07-19 17:29:00 +02:00
parent c06eec15d5
commit 79baeeb96d
4 changed files with 9 additions and 8 deletions
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9
man/systemd-system.conf.xml
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@ -325,12 +325,11 @@
<varlistentry>
<term><varname>DefaultTasksMax=</varname></term>
<listitem><para>Configure the default value for the per-unit
<varname>TasksMax=</varname> setting. See
<listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details. This setting applies to all unit types that
support resource control settings, with the exception of slice
units. Defaults to 512.</para></listitem>
for details. This setting applies to all unit types that support resource control settings, with the exception
of slice units. Defaults to 15%, which equals 4915 with the kernel's defaults on the host, but might be smaller
in OS containers.</para></listitem>
</varlistentry>
<varlistentry>

4
src/core/main.c
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@ -127,7 +127,7 @@ static bool arg_default_io_accounting = false;
static bool arg_default_blockio_accounting = false;
static bool arg_default_memory_accounting = false;
static bool arg_default_tasks_accounting = true;
static uint64_t arg_default_tasks_max = UINT64_C(512);
static uint64_t arg_default_tasks_max = UINT64_MAX;
static sd_id128_t arg_machine_id = {};
noreturn static void freeze_or_reboot(void) {
@ -1558,6 +1558,8 @@ int main(int argc, char *argv[]) {
(void) reset_all_signal_handlers();
(void) ignore_signals(SIGNALS_IGNORE, -1);
arg_default_tasks_max = system_tasks_max_scale(15U, 100U); /* 15% the system PIDs equals 4915 by default. */
if (parse_config_file() < 0) {
error_message = "Failed to parse config file";
goto finish;

2
src/core/manager.c
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@ -569,7 +569,7 @@ int manager_new(UnitFileScope scope, bool test_run, Manager **_m) {
m->exit_code = _MANAGER_EXIT_CODE_INVALID;
m->default_timer_accuracy_usec = USEC_PER_MINUTE;
m->default_tasks_accounting = true;
m->default_tasks_max = UINT64_C(512);
m->default_tasks_max = UINT64_MAX;
#ifdef ENABLE_EFI
if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0)

2
src/core/system.conf
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@ -42,7 +42,7 @@
#DefaultBlockIOAccounting=no
#DefaultMemoryAccounting=no
#DefaultTasksAccounting=yes
#DefaultTasksMax=512
#DefaultTasksMax=15%
#DefaultLimitCPU=
#DefaultLimitFSIZE=
#DefaultLimitDATA=