rcorder(8) with concurrent rc-script execution
==============================================

Testing
=======
If you build rcorder with -DDEBUG (default), you can test that it works
correctly by running rcorder with the -d flag (it will not actually execute
any rc scripts with -d):

./rcorder -d -T ./rc.trampoline -r -s nostart /etc/rc.d/* /usr/local/etc/rc.d/*

A complete patch against current is in current.diff


Install
=======
1. Build this rcorder
2. Make sure it works (see Testing)
3. install new manpage (optional)
4. cp rc.trampoline /etc/rc.trampoline
5. chmod 555 /etc/rc.trampoline
6. Install rcorder to /sbin
7. Patch /etc/rc


Time spend in /etc/rc
=====================
The values below are "time before exit" minus "time of start" (the utility
used to get the time is included as upsecs.c):

My computer:

x concurrent_rcorder
+ traditional
+------------------------------------------------------------+
| x   x                                          +       ++  |
||MA_|                                           |_____A_M__||
+------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   3     12.407667     12.719797      12.42672     12.518061    0.17496775
+   3     16.151403     16.935099     16.817023     16.634508     0.4225264
Difference at 95.0% confidence
	4.11645 +/- 0.732959
	32.8841% +/- 5.85521%
	(Student's t, pooled s = 0.323375)


1 core VirtualBox, default 8.2 install
dhcp, sshd:

x traditional
+ concurrent
+------------------------------------------------------------+
|x   x  x                                          +    ++  +|
| |__A__|                                           |___AM__||
+------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   4      2.257153      2.301959      2.280774     2.2799435   0.018301019
+   4       2.56839      2.625687      2.605807     2.6001423   0.023756568
Difference at 95.0% confidence
	0.320199 +/- 0.0366908
	14.0442% +/- 1.60928%
	(Student's t, pooled s = 0.021205)


1 core VirtualBox, default 8.2 install
dhcp, sshd, moused, ftpd, inetd, ntpd:
x traditional
+ concurrent
+------------------------------------------------------------+
|+              +   +    x                          x x      |
| |_________A___M_____|     |_______________A_______M_______||
+------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   3      2.593638      2.717906      2.709764     2.6737693   0.069515077
+   3      2.489138      2.569741      2.553724     2.5375343   0.042670715
Difference at 95.0% confidence
	-0.136235 +/- 0.130729
	-5.09524% +/- 4.88932%
	(Student's t, pooled s = 0.0576764)


2 core VirtualBox, default 8.2 install
dhcp, sshd, moused, ftpd, inetd, ntpd:

x traditional
+ concurrent
+------------------------------------------------------------+
|  + +            +                            x  x         x|
||___M___A_______|                           |____M_A______| |
+------------------------------------------------------------+
    N           Min           Max        Median           Avg        Stddev
x   3      3.168023       3.49342      3.232705     3.2980493    0.17225915
+   3      2.067178      2.442309      2.115453     2.2083133    0.20407866
Difference at 95.0% confidence
	-1.08974 +/- 0.428024
	-33.0418% +/- 12.9781%
	(Student's t, pooled s = 0.18884)