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From: Peter N Lewis
Subject: profiling information
Date: 5 Aug 2005, 15:44:14

Adriaan suggested I use --propagate-units to improve my compile speed.

I tried that, but given I use --uses=GPCMacOSAll, where GPCMacOSAll 
is all the Mac OS X system interfaces in a single unit, and it 
compiles to a gpi of 27Meg, that would make each of my gpi's 27Meg 
(perhaps worse if it ends up being included multiple times).  But 
regardless, it didn't work because a simple compile of a trivial unit 
ended up taking multiple minutes itself, so something it not happy.

I'll have to see if I can manage to add explicit system units to the 
uses clause of my units in order to get --propagate-units in order to 
see if that will improve things, but I haven't done that yet.

Then I tried turning off one of my processors, reverting back to the 
original gp so it compiles one unit at a time, and using the Mac OS X 
Shark tool to profile the system while compiling some units.

It's not clear from the results what percentage of the time is 
actually being spent inside gpc1, but the report on a gpc1 processes 
is interesting (attached below).  It shows 50+% in import_interface. 
This matches with what Adriaan saw in the progress messages (that the 
progress messages spent a long time in the lines around the uses 
clause).

Enjoy,
    Peter.

# Time Profile of Everything
SharkProfileViewer
# Generated from the visible portion of the outline view
+ 73.0% start (gpc1)
| + 73.0% _start (gpc1)
| | + 72.0% toplev_main (gpc1)
| | | + 70.2% main_yyparse (gpc1)
| | | : + 70.1% yyuserAction (gpc1)
| | | : | + 54.3% do_extra_import (gpc1)
| | | : | | + 54.3% import_interface (gpc1)
| | | : | | | + 41.7% load_gpi_file (gpc1)
| | | : | | | : + 27.4% load_node (gpc1)
| | | : | | | : | - 6.4% get_identifier (gpc1)
| | | : | | | : | - 4.7% load_string (gpc1)
| | | : | | | : | - 4.7% mread1 (gpc1)
| | | : | | | : | - 3.1% set_identifier_spelling (gpc1)
| | | : | | | : | - 1.8% make_node (gpc1)
| | | : | | | : | - 1.4% free (libSystem.B.dylib)
| | | : | | | : |   1.1% szone_free (libSystem.B.dylib)
| | | : | | | : |   0.3% mseek (gpc1)
| | | : | | | : |   0.2% ggc_alloc (gpc1)
| | | : | | | : |   0.1% itab_store_node (gpc1)
| | | : | | | : | - 0.1% ht_lookup (gpc1)
| | | : | | | : | - 0.1% build_decl (gpc1)
| | | : | | | : |   0.1% sort_fields (gpc1)
| | | : | | | : |   0.1% dyld_stub_free (gpc1)
| | | : | | | : |   0.1% allocate_decl_lang_specific (gpc1)
| | | : | | | :   11.8% compute_checksum (gpc1)
| | | : | | | : - 1.5% gpi_open (gpc1)
| | | : | | | : - 0.1% mread1 (gpc1)
| | | : | | | - 12.4% import_node (gpc1)
| | | : | - 13.2% finish_routine (gpc1)
| | | : | - 2.0% finalize_module (gpc1)
| | | : | - 0.3% import_interface (gpc1)
| | | : | - 0.1% build_predef_call (gpc1)
| | | : | - 0.1% start_unit_implementation (gpc1)
| | | : - 0.2% yylex (gpc1)
| | | - 1.5% write_global_declarations (gpc1)
| | | - 0.1% init_regs (gpc1)
| | | - 0.1% yyparse (gpc1)
| | | - 0.1% lang_init_3_4 (gpc1)
| | | - 0.1% init_emit_once (gpc1)
| |   0.8% write_global_declarations (gpc1)
| |   0.1% recog_12 (gpc1)
| |   0.1% init_regs (gpc1)
| | - 0.1% _call_mod_init_funcs (gpc1)
- 15.9% thandler (mach_kernel)
- 10.7% shandler (mach_kernel)
- 0.3% unix_syscall (mach_kernel)
- 0.1% thread_continue (mach_kernel)
- 0.1% _dyld_start (dyld)

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