diff --git a/garlic/doc/slides/Makefile b/garlic/doc/slides/Makefile
new file mode 100644
index 0000000..01c7ff7
--- /dev/null
+++ b/garlic/doc/slides/Makefile
@@ -0,0 +1,6 @@
+all: test.mm Makefile
+	groff -Tpdf -t -p -P-p12c,16c -mm test.mm > test.pdf
+	-killall -HUP mupdf
+
+watch:
+	while [ 1 ]; do inotifywait -e modify *; make; done
diff --git a/garlic/doc/slides/test.mm b/garlic/doc/slides/test.mm
new file mode 100644
index 0000000..4616f71
--- /dev/null
+++ b/garlic/doc/slides/test.mm
@@ -0,0 +1,857 @@
+.\"usage: NS title
+.de NS \" New Slide
+.SK
+.ev gp-top
+.fam H
+.vs 1.5m
+.ll \\n[@ll]u
+.lt \\n[@ll]u
+.rs
+.sp 2v
+.ps +5
+\\$*
+.ps -5
+.sp 1.5v
+.br
+.ev
+..
+.\" Remove headers
+.de TP
+..
+.\" Bigger page number in footer
+.de EOP
+.fam H
+.ps +2
+.	ie o .tl \\*[pg*odd-footer]
+.	el .tl \\*[pg*even-footer]
+.	ds hd*format \\g[P]
+.	af P 0
+.	ie (\\n[P]=1)&(\\n[N]=1) .tl \\*[pg*header]
+.	el .tl \\*[pg*footer]
+.	af P \\*[hd*format]
+.	tl ''\\*[Pg_type!\\n[@copy_type]]''
+..
+.\" Remove top and bottom margin
+.VM 0 0
+.\"
+.\"
+.\" Set virtual page dimensions for a physical size of 16x12 cm
+.PGFORM 14c 12c 1c 1
+.ND "November 24, 2020"
+.\" .vs 1.5m
+.S C 1.5m
+.fam H
+.\".PH "'cosas'''"
+.COVER ms
+.de cov@print-date
+.DS C
+.fam H
+.B
+\\*[cov*new-date]
+.DE
+..
+.TL
+.ps 20
+.fam H
+Garlic update
+.AF "Barcelona Supercomputing Center"
+.AU "Rodrigo Arias Mallo"
+.COVEND
+.PF "'''%'"
+.\" Turn off justification
+.SA 0
+.\".PF '''%'
+.\"==================================================================
+.NS "Changelog"
+Important changes since the last meeting (2020-09-23)
+.BL
+.LI
+Execution of experiments is now \fBisolated\fP: no $HOME or /usr at run time
+.LI
+Added a \fBpostprocess\fP pipeline
+.LI
+New \fBgarlic(1)\fP helper tool (manual included)
+.LI
+A plot has an experiment result as \fBdependency\fP
+.LI
+Experiments run on demand based on article \fBfigures\fP
+.LI
+Fast pkg overrides (MPI)
+.LE 1
+.\"==================================================================
+.NS "Execution pipeline (review)"
+.2C
+List of stages required to run the program of the experiment:
+.BL
+.S -1
+.LI
+The
+.B target
+column determines where the stage is running.
+.LI
+.B Safe
+states if the stage begins the execution inside the isolated namespace
+.LI
+.B User
+if it can be executed directly by the user
+.LI
+.B Copies
+if there are several instances running in parallel and
+.LI
+.B Std
+if is part of the standard execution pipeline.
+.LE
+.S P P
+.\" Go to the next column
+.NCOL
+.KF
+.defcolor white rgb #FFFFFF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+\m[white]\(rh\m[]\
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBtrebuchet\fP: connects via ssh to the target machine and executes the
+next stage there.
+.P
+The target machine is set to MN4, which by default uses the host
+\fBmn1\fP
+.P
+Literally:
+.P
+.VERBON
+ssh mn1 /path/to/next/stage 
+.VERBOFF
+.P
+You need to define the ssh config to be able to connect to mn1.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+\(rh	\fBtrebuchet\fP	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBrunexp\fP: sets a few \fCGARLIC_*\fP environment variables used by the
+benchmark and changes the current directory to the \fBout\fP directory.
+.P
+At build time, next stages don't know these values (cyclic dependency),
+so they are populated at execution time.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+\(rh	\fBrunexp\fP  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBisolate\fP: once on the target machine, we enter an isolated
+namespace to load the nix store.
+.P
+Notice that this and the previous stages require the \fBsh\fP shell to be
+available on the target machine
+.P
+They are not \fBsafe\fP as we run target machine code
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+\(rh	\fBisolate\fP 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBexperiment\fP: runs several units sequentially.
+.P
+Defines the \fCGARLIC_EXPERIMENT\fP environment variable.
+.P
+Creates a directory for the experiment and changes the current directory
+there.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+\(rh	\fBexperiment\fP	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBunit\fP: creates an index entry for the unit and the experiment.
+.P
+Creates a directory for the unit and changes the current directory
+there.
+.P
+Copies the unit configuration in the \fCgarlic_config.json\fP file
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+\(rh	\fBunit\fP    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBsbatch\fP: allocates resources and executes the next stage in the
+first node.
+.P
+The execve call is performed by a SLURM daemon, so is \fBout\fP of the
+isolated environment.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+\(rh	\fBsbatch\fP  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBisolate\fP: enters the isolated namespace again, with the nix store.
+.P
+Notice that we are now running in the compute node allocated by SLURM.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+\(rh	\fBisolate\fP 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBcontrol\fP: runs the next stage several times
+.P
+Is controlled by the \fCloops\fP attribute, which specifies the number
+of runs.
+.P
+Creates a directory with the number of the run and enters it.
+.P
+Generated results are placed in this directory.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+\(rh	\fBcontrol\fP 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBsrun\fP: launches the tasks in the compute nodes and sets the
+affinity.
+.P
+From here on, all stages are executed in parallel for each task.
+.P
+The srun program also forks from a SLURM daemon, exiting the
+previous isolated namespace.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+\(rh	\fBsrun\fP    	comp	yes	no	no	yes
+	isolate    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBisolate\fP: enter the isolated namespace again.
+.P
+Now we are ready to execute the program of the experiment.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+\(rh	\fBisolate\fP 	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBexec\fP: sets the environment variables and argv of the program.
+.P
+Additional commands can be specified in the \fCpre\fP and \fCpost\fP
+attributes.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate 	comp	no	yes	no	yes
+	_	_	_	_	_	_
+\(rh	\fBexec\fP    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+\fBprogram\fP: the path to the program itself.
+.P
+This stage can be used to do some changes:
+.BL
+.LI
+Set the mpi implementation of all dependencies.
+.LI
+Pass build options
+.LI
+Custom packages (nanos6 with jemalloc)
+.LE
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate 	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+\(rh	\fBprogram\fP	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Execution stages"
+.2C
+The \fCstdexp.nix\fP file defines standard pipeline. The last two stages
+are usually added to complete the pipeline:
+.P
+.VERBON
+pipeline = stdPipeline ++
+  [ exec program ];
+.VERBOFF
+.P
+Any stage can be modified to fit a custom experiment.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+	isolate 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+	isolate 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+	isolate 	comp	no	yes	no	yes
+	_	_	_	_	_	_
+\m[white]\(rh\m[]\
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Isolated execution"
+.2C
+The filesystem is \fBnow\fP isolated to prevent irreproducible
+scenarios.
+.P
+The nix store is mounted at /nix and only some other paths are
+available like:
+.BL
+.S -1 1m
+.LI
+/var/run/munge (required for SLURM)
+.LI
+/dev, /sys, /proc for MPI comm
+.LI
+/etc for hosts (FIXME)
+.LI
+/gpfs/projects/bsc15 to store data
+.LE
+.S P P
+.P
+Additional mounts can be requested by using the \fCextraMounts\fP
+attribute.
+.\" Go to the next column
+.NCOL
+.KF
+.S 8 14p
+.\".S C +0.2v
+.TS
+center expand;
+lB lB cB cB cB cB cB
+lB lB cB cB cB cB cB
+r  lw(5.5m)  c  c  c  c  c.
+	_	_	_	_	_	_
+	Stage     	Target	Safe	Copies	User	Std
+	_	_	_	_	_	_
+	trebuchet	xeon	no	no	yes	yes
+	runexp  	login	no	no	yes	yes
+\(rh	\fBisolate\fP 	login	no	no	no	yes
+	experiment	login	yes	no	no	yes
+	unit    	login	yes	no	no	yes
+	sbatch  	login	yes	no	no	yes
+	_	_	_	_	_	_
+\(rh	\fBisolate\fP 	comp	no	no	no	yes
+	control 	comp	yes	no	no	yes
+	srun    	comp	yes	no	no	yes
+\(rh	\fBisolate\fP    	comp	no	yes	no	yes
+	_	_	_	_	_	_
+	exec    	comp	yes	yes	no	no
+	program    	comp	yes	yes	no	no
+	_	_	_	_	_	_
+.TE
+.S P P
+.KE
+.1C
+.\"==================================================================
+.NS "Generating figures"
+The postprocess pipeline takes the results of the execution and produces
+figures or tables to be used in a publication.
+.DS CB
+.PS 5.3
+circlerad=0.3;
+ellipsewid=1.2;
+linewid=0.3;
+boxwid=1;
+right
+box "Experiment"
+arrow
+ellipse "Execution"
+arrow
+box "Result"
+arrow
+ellipse "Postprocess"
+arrow
+box "Figure"
+.PE
+.DE
+.P
+Once the results are available, multiple figures can be created without
+re-running the experiment.
+.P
+The postprocess pipeline is \fBexperimental\fP; there is no standard
+yet.
+.\"==================================================================
+.NS "Executing experiments"
+.P
+We cannot access MN4 from nix, as it doesn't has the SSH keys nor
+network access when building derivations.
+.P
+The garlic(1) tool is used to run experiments and fetch the results. See
+the manual for details.
+.P
+.VERBON
+xeon07$ nix-build -A fig.nbody.small
+\&...
+/tmp/garlic/1qcc44lx2nxwi7rmr6389sksq3gwy9w5-experiment: not found
+Run the experiment and fetch the results with:
+
+\f[CB]garlic -RFv /nix/store/5zhmdzi5mf0mfsran74cxngn07ba522m-trebuchet\fP
+
+See garlic(1) for more details.
+cannot continue building /nix/store/jql4...2cb0-resultTree, aborting
+.VERBOFF
+.\"==================================================================
+.NS "Executing experiments"
+.P
+To run an experiment use \fB-R\fP and provide the trebuchet path:
+.P
+.VERBON
+xeon07$ garlic -Rv /nix/store/5zh...22m-trebuchet
+Running experiment 1qcc...9w5-experiment
+sbatch: error: spank: x11.so: Plugin file not found
+Submitted batch job 12719522
+\&...
+xeon07$ 
+.VERBOFF
+.P
+Once the experiment is submited, you can leave the session: it will run
+in MN4 automatically at some point.
+
+.\"==================================================================
+.NS "Executing experiments"
+.P
+To wait and fetch the results, use \fB-F\fP:
+.P
+.VERBON
+xeon07$ garlic -Fv /nix/store/5zhmd...522m-trebuchet
+/mnt/garlic/bsc15557/out/1qc...9w5-experiment: checking units
+3qnm6drx5y95kxrr43gnwqz8v4x641c7-unit: running 7 of 10
+awd3jzbcw0cwwvjrcrxzjvii3mgj663d-unit: completed
+bqnnrwcbcixag0dfflk1zz34zidk97nf-unit: no status
+l32097db7hbggvj7l5hz44y1glzz6jcy-unit: no status
+n1a26qa13fdz0ih1gg1m0wfcybs71hm9-unit: completed
+rywcwvnpz3mk0gyp5dzk94by3q1h3ljp-unit: completed
+yl8ygadghd1fyzjwab3csd8hq1q93cw3-unit: completed
+\&...
+/mn...w5-experiment: \f[CB]execution complete, fetching results\fP
+these derivations will be built:
+  /nix/store/mqdr...q4z-resultTree.drv
+\&...
+\f[CB]/nix/store/jql41hms1dr49ipbjcw41i4dj4pq2cb0-resultTree\fP
+.VERBOFF
+.\"==================================================================
+.NS "Execution"
+The dependency graph shows the role of the garlic tool:
+.DS CB
+.PS
+scale=1;
+circlerad=0.25;
+linewid=0.3;
+diag=linewid + circlerad;
+far=circlerad*3 + linewid*4
+circle "Prog"
+arrow
+E: circle "EP"
+R: circle "Result" at E + (far,0)
+RUN: circle "Run" at E + (diag,-diag) dashed
+FETCH: circle "Fetch" at R + (-diag,-diag) dashed
+move to R.e
+arrow
+P: circle "PP"
+arrow
+circle "Plot"
+arrow dashed from E to RUN chop
+arrow dashed from RUN to FETCH chop
+arrow dashed from FETCH to R chop
+arrow from E to R chop
+.PE
+.DE
+With the two pipelines
+.BL
+.LI
+EP: Execution pipeline
+.LI
+PP: Postprocess pipeline
+.LE