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bootrc: set $NPROC for gefs

Also document that gefs looks at $NPROC in its man page.

--- a/sys/man/4/gefs

+++ b/sys/man/4/gefs

@@ -32,6 +32,10 @@

 is an experimental file server.

 It attempts to be crash safe, snapshotting, and corruption-detecting,

 without giving up too much performance.

+.I Gefs

+makes use of concurrent processes,

+the allocation of which is determined by reading

+.BR $NPROC .

 .PP

 Gefs allows multiple snapshots to be mounted and maintained concurrently.

 These snapshots all share the same storage pool, but can be written to,

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -20,6 +20,11 @@

 # usually better than 1970

 cat '#r/rtc' >/dev/time >[2]/dev/null

+# gefs uses $NPROC

+nl='

+'

+NPROC=`$nl{cat /dev/sysstat}; NPROC=$#NPROC

+

 # reparse variables

 for(i in `{ls -Qp /env}){

 	switch($i){

-- 

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