mirror of https://github.com/schoebel/mars
user-manual: describe --parallel
This commit is contained in:
Thomas Schoebel-Theuer
Thomas Schoebel-Theuer
parent
869d9e14e6
commit
b178a5c7ec
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@ -6356,6 +6356,57 @@ safety measure
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or hostD will restart from point 0, in order to ensure consistency.
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\end_layout
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\begin_layout Standard
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\noindent
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\begin_inset Graphics
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filename images/lightbulb_brightlit_benj_.png
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lyxscale 12
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scale 7
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\end_inset
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Tip: newer versions of
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\family typewriter
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mars
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\family default
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+
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\family typewriter
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marsadm
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\family default
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are supporting the option
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\family typewriter
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--parallel
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\family default
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combined with
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\family typewriter
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all
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\family default
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, e.g.
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\family typewriter
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marsadm primary all --parallel
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\family default
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.
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Instead of waiting until
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\emph on
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all
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\emph default
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the resources have left the primary role at the old primary (barrier synchoniza
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tion), the handover speed of each resource is treated
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\emph on
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individually
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\emph default
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.
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Slow resources will no longer retard fast ones, minimizing total downtime.
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However, check that your cluster manager can deal with a rather high parallelis
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m degree.
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At the moment, the
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\family typewriter
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systemd
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\family default
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interface is not yet prepared for this.
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\end_layout
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\begin_layout Subsection
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Forced Switching
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\begin_inset CommandInset label
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@ -6889,6 +6940,47 @@ very last
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chance if nothing else had succeeded before.
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\end_layout
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\begin_layout Standard
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\noindent
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\begin_inset Graphics
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filename images/lightbulb_brightlit_benj_.png
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lyxscale 12
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scale 7
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\end_inset
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Tip: newer versions of
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\family typewriter
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mars
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\family default
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+
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\family typewriter
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marsadm
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\family default
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are supporting the option
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\family typewriter
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--parallel
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\family default
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combined with
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\family typewriter
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all
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\family default
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, e.g.
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\family typewriter
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marsadm primary --force all --parallel
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\family default
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.
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This may potentially speed up startup.
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However, check that your cluster manager can deal with a rather high parallelis
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m degree.
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At the moment, the
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\family typewriter
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systemd
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\family default
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interface is not yet prepared for this.
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\end_layout
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\begin_layout Section
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Split Brain Resolution
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\begin_inset CommandInset label
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@ -9391,7 +9483,7 @@ marsadm
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\size scriptsize
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\begin_inset Tabular
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<lyxtabular version="3" rows="11" columns="3">
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<lyxtabular version="3" rows="13" columns="3">
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<features islongtable="true" longtabularalignment="left">
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<column alignment="left" valignment="top" width="0pt">
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<column alignment="center" valignment="top">
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@ -9699,6 +9791,231 @@ for no good reason
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\end_inset
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\end_layout
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\end_inset
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</cell>
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</row>
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<row>
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\family typewriter
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\size scriptsize
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\begin_inset Box Frameless
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position "t"
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hor_pos "c"
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has_inner_box 1
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inner_pos "t"
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use_parbox 0
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use_makebox 0
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width "20col%"
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special "none"
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height "1in"
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height_special "totalheight"
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thickness "0.4pt"
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separation "3pt"
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shadowsize "4pt"
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framecolor "black"
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backgroundcolor "none"
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status open
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\begin_layout Plain Layout
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\family typewriter
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\size scriptsize
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--parallel
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\end_layout
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\end_inset
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\end_layout
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\end_inset
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</cell>
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\size scriptsize
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no
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\end_layout
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\end_inset
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</cell>
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<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\size scriptsize
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\begin_inset Box Frameless
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position "t"
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hor_pos "c"
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has_inner_box 1
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inner_pos "t"
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use_parbox 0
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use_makebox 0
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width "60col%"
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special "none"
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height "1in"
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height_special "totalheight"
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thickness "0.4pt"
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separation "3pt"
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shadowsize "4pt"
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framecolor "black"
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backgroundcolor "none"
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status open
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\begin_layout Plain Layout
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\size scriptsize
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Only makes sense in combination with
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\family typewriter
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all
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\family default
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.
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This is roughly equivalent to forking a bunch of parallel
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\family typewriter
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marsdm
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\family default
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processes, like in pseudo shell script notation:
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\family typewriter
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for i in $resource_list; do marsadm $parameters $i & done; wait
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\family default
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.
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\end_layout
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\begin_layout Plain Layout
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\begin_inset Graphics
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filename images/MatieresCorrosives.png
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lyxscale 50
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scale 17
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\end_inset
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Several cluster managers are not re-entrant and may deadlock.
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First check whether this option is usable in your concrete environment!
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\end_layout
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\end_inset
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\end_layout
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\end_inset
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</cell>
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</row>
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<row>
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\family typewriter
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\size scriptsize
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\begin_inset Box Frameless
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position "t"
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hor_pos "c"
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has_inner_box 1
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inner_pos "t"
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use_parbox 0
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use_makebox 0
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width "20col%"
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special "none"
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height "1in"
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height_special "totalheight"
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thickness "0.4pt"
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separation "3pt"
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shadowsize "4pt"
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framecolor "black"
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backgroundcolor "none"
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status open
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\begin_layout Plain Layout
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\family typewriter
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\size scriptsize
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--parallel=$number
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\end_layout
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\end_inset
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\end_layout
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\end_inset
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</cell>
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\size scriptsize
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no
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\end_layout
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\end_inset
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</cell>
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<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
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\begin_inset Text
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\begin_layout Plain Layout
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\size scriptsize
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\begin_inset Box Frameless
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position "t"
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hor_pos "c"
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has_inner_box 1
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inner_pos "t"
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use_parbox 0
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use_makebox 0
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width "60col%"
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special "none"
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height "1in"
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height_special "totalheight"
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thickness "0.4pt"
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separation "3pt"
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shadowsize "4pt"
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framecolor "black"
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backgroundcolor "none"
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status open
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\begin_layout Plain Layout
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\size scriptsize
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Like
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\family typewriter
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--parallel
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\family default
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, but limit the parallelism degree to a maximum number of parallel processes.
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This may be useful for limiting the parallelism of startup processes, e.g.
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when kernel caches are cold, so the machine would get
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\emph on
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overloaded
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\emph default
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when too many resources would be starting in parallel.
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\end_layout
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\begin_layout Plain Layout
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\begin_inset Graphics
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filename images/MatieresCorrosives.png
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lyxscale 50
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scale 17
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\end_inset
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Several cluster managers are not re-entrant and may deadlock.
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First check whether this option is usable in your concrete environment!
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\end_layout
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\end_inset
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\end_layout
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\end_inset
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@ -9750,7 +10067,7 @@ status open
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\begin_layout Plain Layout
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\size scriptsize
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almost
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no
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\end_layout
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\end_inset
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