Kenneth Harrison wrote:
Perhaps this might be something to think about Bruce:
Original Wording:
"As in LFS, each package has a build time listed in Standard Build
Units (SBUs). These times are relative to the time it took to build
binutils in LFS. Most times listed are for a single processor or core
to build the package. In some cases, large, long running packages
tested on multi-core systems have SBU times listed with comments such
as '(parallelism=4)'. These values indicate testing was done using
multiple cores. Note that while this speeds up the build on systems
with the appropriate hardware, the speedup is not linear and to some
extent depends on the individual package."
My Proposal (longer but explained):
"In LFS, each package has a build time listed in Standard Build Units
(SBUs). These times reflect
a benchmark against CPU speed, system RAM, and data access
(read/write) speeds of your system.
All times are listed in reflection against a standard single core CPU
design when building the package.
In the case of multi-core systems SBU times listed, when using
parallel make (such as make -j4) with
a quad-core CPU, may be substantially less than those of a standard
single core CPU. Be advised this speed is dependent entirely on
hardware and may be limited in part by the package*.
*Note: Some packages may force requirements of using make flags such
as -j1 in the build, testing,
and installation phases. Most packages known to have limits to
parallelism will be marked as such.
The build and install of binutils in Chapter 5.4 is set at 1.0 SBU as
a baseline for your calculation needs. Usage of the listed "time"
command per the example given should give you an approximate time
frame for calculating 1.0 SBU on your system that will be installing
LFS. Once you have acquired what 1.0 SBU will be on your system, you
can then calculate the overall time to build LFS completely."
There are some good things here that I'll incorporate. Thanks.
-- Bruce
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