Simple Example, Instrumentation, Proﬁle, Optimize

Ways to Improve Performance

Proﬁle-Based Optimization

A Simple Example

Suppose you want to apply PBO to an application called sample. The application is built from a C source ﬁle sample.c. Discussed below are the steps involved in optimizing the application.

Step 1 Instrumentation

First, compile the application for instrumentation and level 2 optimization:

$ cc -v-c +I -O sample.c /opt/langtools/lbin/cpp sample.c /var/tmp/ctm123 /opt/ansic/lbin/ccom /var/tmp/ctm123 sample.o -O2 -I $ cc -v-o sample.inst +I -O sample.o /usr/ccs/bin/ld /opt/langtools/lib/icrt0.o -u main \

-o sample.inst sample.o -I -lc

At this point, you have an instrumented program called sample.inst.

Step 2 Proﬁle

Assume you have two representative input ﬁles to use for proﬁling, input.file1 and input.file2. Now execute the following three commands:

$ sample.inst < input.file1 $ sample.inst < input.file2 $ mv flow.data sample.data

The ﬁrst invocation of sample.inst creates the flow.data ﬁle and places an entry for that executable ﬁle in the data ﬁle. The second invocation increments the counters for sample.inst in the flow.data ﬁle. The third command moves the flow.data ﬁle to a ﬁle named sample.data.

Step 3 Optimize

To perform proﬁle based optimizations on this application, relink the program as follows:

$ cc -v -o sample.opt +P +pgm sample.inst \ +df sample.data sample.o

/usr/ccs/bin/ld /usr/ccs/lib/crt0.o -u main -o sample.opt \ +pgm sample.inst +df sample.data sample.o -P -lc

Note that it was not necessary to recompile the source ﬁle. The +pgm option was used because the executable name used during instrumentation, sample.inst, does not match the current output ﬁle name, sample.opt. The +df option is necessary because the proﬁle database ﬁle for the program has been moved from flow.data to sample.data.

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Chapter 8

HP 9000 specifications

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In summary, the Kenwood HP 9000 is an exceptional kitchen appliance that combines power, versatility, and safety. With its advanced features and user-friendly design, it is an ideal choice for anyone looking to simplify their cooking process while achieving professional-level results. Whether you're whipping up a quick meal or tackling an elaborate recipe, the HP 9000 is a reliable companion that will inspire culinary creativity.

Kenwood HP 9000 manual Simple Example, Instrumentation, Proﬁle, Optimize, 276

Models: HP 9000