Bug#423259: boinc-client: Use advanced scheduling

[Omen Wild]

Package: boinc-client
Version: 5.8.17-1+b1
Severity: wishlist
Tags: patch

I have attached a patch to the init script to make the boinc client
(and children) get scheduled with more advanced schedulers if available
and if the schedtool package is installed.  It first tries idleprio,
then batch, and falls back to nice if neither of those is available.
It also tries to schedule the IO to batch using the ionice command if
that is installed.

I also added a print out of current scheduling to the status command.

The advance scheduling makes the boinc computations interfere as little
as possible with current operations, even less so than using nice does.

The while loop waiting for the pid file may seem like overkill but I've
had a couple times where it took a little while for the pid file to
show up.

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.21.1-ck1-1 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages boinc-client depends on:
ii  adduser  3.102                           Add and remove users and groups
ii  ca-certi 20070303                        Common CA Certificates PEM files
ii  debconf  1.5.13                          Debian configuration management sy
ii  libc6    2.5-7                           GNU C Library: Shared libraries
ii  libcomer 1.39+1.40-WIP-2007.04.07+dfsg-2 common error description library
ii  libcurl3 7.15.5-1                        Multi-protocol file transfer libra
ii  libgcc1  1:4.1.2-6                       GCC support library
ii  libidn11 0.6.5-1                         GNU libidn library, implementation
ii  libkrb53 1.6.dfsg.1-3                    MIT Kerberos runtime libraries
ii  libssl0. 0.9.8e-4                        SSL shared libraries
ii  libstdc+ 4.1.2-6                         The GNU Standard C++ Library v3
ii  lsb-base 3.1-23.1                        Linux Standard Base 3.1 init scrip
ii  python   2.4.4-3                         An interactive high-level object-o
ii  zlib1g   1:1.2.3-13                      compression library - runtime

boinc-client recommends no packages.

-- debconf information excluded
-------------- next part --------------
--- boinc-client.init.old	2007-05-01 11:36:36.000000000 -0700
+++ boinc-client.init	2007-05-10 16:05:04.000000000 -0700
@@ -94,11 +94,64 @@
   log_end_msg 0
 }
 
+schedule()
+{
+  log_begin_msg "Setting up scheduling for $DESC and children:"
+
+  if ! is_running; then
+    log_progress_msg "not running"
+    log_end_msg 0
+  else
+    local pid max
+    max=5
+    while [[ $max -gt 0 ]]; do
+      if [[ -f $PIDFILE ]]; then
+        pid=$(cat $PIDFILE)
+        break
+      fi
+      sleep 1
+      max=$((max-1))
+    done
+    
+    if [[ -z $pid ]]; then
+      log_failure_msg "unable to find pid to do scheduling."
+      return 1
+    fi
+
+    if ! which schedtool >/dev/null; then
+    log_progress_msg "Warning: no schedtool in the path"
+    else
+      children=$(ps --ppid $pid -opid= || true)
+      ( sudo schedtool -n 20 -D $pid $children >/dev/null && log_progress_msg "idleprio,") || \
+       (sudo schedtool -n 20 -B $pid $children >/dev/null && log_progress_msg "batch," ) || \
+       (sudo schedtool -n 20    $pid $children            && log_progress_msg "only niced,")
+    fi
+    if ! which ionice >/dev/null; then
+      log_progress_msg "Warning: no ionice in the path"
+    else
+      ionice -n 4 -c 3 -p $pid
+      log_progress_msg "ioniced"
+    fi
+
+    log_end_msg 0
+  fi
+}
+
 status()
 {
   STATUS="Status of $DESC:"
   if is_running; then
     log_success_msg "$STATUS running."
+    if which schedtool >/dev/null; then
+      local pid
+      pid=$(cat $PIDFILE)
+      log_success_msg ""
+      log_success_msg "Scheduling of $DESC:"
+      schedtool -v $pid
+      log_success_msg ""
+      log_success_msg "Scheduling of $DESC's children:"
+      schedtool -v $(ps --ppid $pid -opid=)
+    fi
   else
     log_success_msg "$STATUS stopped."
   fi
@@ -107,6 +160,11 @@
 case "$1" in
   start)
     start
+    schedule
+    ;;
+
+  schedule)
+    schedule
     ;;
 
   stop)
@@ -124,7 +182,7 @@
     ;;
 
   *)
-    log_success_msg "Usage: $0 {start|stop|restart|force-reload|status}" >&2
+    log_success_msg "Usage: $0 {start|stop|restart|force-reload|status|schedule}" >&2
     exit 1
     ;;
 esac