Clarify some sections

garlic/doc/pp.ms

@@ -25,11 +25,10 @@ move-punctuation
 .NH 1
 Introduction
 .LP
-After the correct execution of an experiment some measurements are
+After the correct execution of an experiment the results are stored for
-recorded in the results for further investigation. Typically the time of
+further investigation. Typically the time of the execution or other
-the execution or other quantities are measured and presented later in a
+quantities are measured and presented later in a figure (generally a
-figure (generally a plot or a table).
+plot or a table). The
-The
 .I "postprocess pipeline"
 consists of all the steps required to create a set of figures from the
 results. Similarly to the execution pipeline where several stages run
@@ -52,9 +51,9 @@ Results
 The results are generated in the same
 .I "target"
 machine where the experiment is executed and are stored in the garlic
-.I output ,
+.I out
-organized into a directory structure following the experiment name, the
+directory, organized into a tree structure following the experiment
-unit name and the run number (governed by the
+name, the unit name and the run number (governed by the
 .I control
 stage):
 .QS
@@ -76,15 +75,18 @@ and
 attributes (defined in the experiment configuration) and linking them to
 the appropriate experiment and unit directories. These links are
 overwritten by the last experiment with the same names so they are only
-valid for the last execution. The output and index directories are
+valid for the last execution. The out and index directories are
 placed into a per-user directory, as we cannot guarantee the complete
-execution of each unit when multiple users can share units.
+execution of each unit when multiple users share units.
 .PP
-The messages printed to the standard output and error are
+The messages printed to 
+.I stdout
+and
+.I stderr
 are stored in the log files with the same name inside each run
 directory. Additional data is sometimes generated by the experiments,
 and is found in each run directory. As the generated data can be very
-large, is ignored by default when considering the results.
+large, is ignored by default when fetching the results.
 .NH 1
 Fetching the results
 .LP
@@ -93,14 +95,16 @@ measure some properties that the experimenter wants to present in a
 visual plot. When the experiment is launched, the execution
 pipeline (EP) is completely executed and it will generate some
 results. In this escenario, the execution pipeline depends on the
-program\[em]any changes in the program will cause nix to build it again
+program\[em]any changes in the program will cause nix to build the
+pipeline again
 using the updated program. The results will also depend on the
-execution pipeline, and the graph on the results. This chain of
+execution pipeline as well as the postprocess pipeline (PP) and the plot
-dependencies can be shown in the following dependency graph:
+on the results. This chain of dependencies can be shown in the
+following dependency graph:
 .ie t \{\
 .PS
 circlerad=0.22;
-linewid=0.35;
+linewid=0.3;
 right
 circle "Prog"
 arrow
@@ -122,15 +126,15 @@ circle "Plot"
 .\}
 Ideally, the dependencies should be handled by nix, so it can detect any
 change and rebuild the necessary parts automatically. Unfortunately, nix
-is not able to build the result as a derivation directly as it requires access
+is not able to build the result as a derivation directly, as it requires
-to the
+access to the
 .I "target"
 machine with several user accounts. In order to let several users reuse
-the same results from a cache, we
+the same results from a shared cache, we would like to use the
-use the
+.I "nix store" .
-.I "nix store"
+.PP
-to make them available. To generate the results from the
+To generate the results from the
-experiment, we add some extra steps that must be executed manually.
+experiment, we add some extra steps that must be executed manually:
 .PS
 circle "Prog"
 arrow