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authorLukas Larsson <[email protected]>2011-02-02 10:52:42 +0100
committerLukas Larsson <[email protected]>2011-02-02 10:59:23 +0100
commitcb119ebc0e923b6b85a8352ef71012eb431b54d5 (patch)
tree8ad219c5bba26f2606d22a8f4673546ff92f765d /lib/tools/src/cover.erl
parente24ae469ca5c2814dfd133da1e6882b84a7db95b (diff)
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Update documentation to reflect performance enhancement changes of cover
Diffstat (limited to 'lib/tools/src/cover.erl')
-rw-r--r--lib/tools/src/cover.erl34
1 files changed, 24 insertions, 10 deletions
diff --git a/lib/tools/src/cover.erl b/lib/tools/src/cover.erl
index 50a812aa09..cc4f75f2e8 100644
--- a/lib/tools/src/cover.erl
+++ b/lib/tools/src/cover.erl
@@ -35,23 +35,37 @@
%% remote_process_loop/1.
%%
%% TABLES
-%% Each nodes has an ets table named 'cover_internal_data_table'
-%% (?COVER_TABLE). This table contains the coverage data and is
-%% continously updated when cover compiled code is executed.
+%% Each nodes has two tables: cover_internal_data_table (?COVER_TABLE) and.
+%% cover_internal_clause_table (?COVER_CLAUSE_TABLE).
+%% ?COVER_TABLE contains the bump data i.e. the data about which lines
+%% have been executed how many times.
+%% ?COVER_CLAUSE_TABLE contains information about which clauses in which modules
+%% cover is currently collecting statistics.
%%
-%% The main node owns a table named
-%% 'cover_collected_remote_data_table' (?COLLECTION_TABLE). This table
-%% contains data which is collected from remote nodes (either when a
-%% remote node is stopped with cover:stop/1 or when analysing. When
-%% analysing, data is even moved from the ?COVER_TABLE on the main
-%% node to the ?COLLECTION_TABLE.
+%% The main node owns tables named
+%% 'cover_collected_remote_data_table' (?COLLECTION_TABLE) and
+%% 'cover_collected_remote_clause_table' (?COLLECTION_CLAUSE_TABLE).
+%% These tables contain data which is collected from remote nodes (either when a
+%% remote node is stopped with cover:stop/1 or when analysing). When
+%% analysing, data is even moved from the COVER tables on the main
+%% node to the COLLECTION tables.
%%
%% The main node also has a table named 'cover_binary_code_table'
%% (?BINARY_TABLE). This table contains the binary code for each cover
%% compiled module. This is necessary so that the code can be loaded
%% on remote nodes that are started after the compilation.
%%
-
+%% PARELLALISM
+%% To take advantage of SMP when doing the cover analysis both the data
+%% collection and analysis has been parallelized. One process is spawned for
+%% each node when collecting data, and on the remote node when collecting data
+%% one process is spawned per module.
+%%
+%% When analyzing data it is possible to issue multiple analyse(_to_file)/X
+%% calls at once. They are however all calls (for backwardscompatability
+%% reasons) so the user of cover will have to spawn several processes to to the
+%% calls ( or use async_analyse_to_file ).
+%%
%% External exports
-export([start/0, start/1,