3

–time

The –timeoption instructs the compiler to report execution performance statistics for the various compilation passes. Here is some sample output; some spaces have been removed so the output would fit on the page.

hostname% pc -time hello.p

cpp:time U:0.0s+S:0.1s=0.2s REAL:1.6s 11%. core T:0k D:0k. io IN:4b OUT:3b. pf IN:25p OUt:184p. pc0:time U:0.0s+S:0.3s=0.4s REAL:3.2s 13%. core T:0k D:4k. io IN:4b OUT:4b. pf IN:70pOUT:131p. cg: time U:0.0s+S:0.1s=0.2s REAL:2.0s 12%. core T:0k D:1k. io IN:2b OUT:1b. pf IN:39p OUT:163p. as: time U:0.0s+S:0.2s=0.3s REAL:1.5s 19%. core T:0k D:1k. io IN:3b OUT:10b.pf IN:33pOUT:117p. pc3:time U:0.1s+S:0.1s=0.3s REAL:0.9s 31%. core T:0k D:1k. io IN:7b OUT:0b. pf IN:20pOUT:109p. ld:time U:0.8s+S:0.9s=1.8sREAL:10.2s 17%. core T:0k D:21k.io IN:74bOUT:29b.pf IN:89pOUT:184p.

Each line begins with the name of the compiler pass. The rest of the line is divided into four parts: time, core, io, and pf.

•time gives the time used by that pass of the compiler, in this order:

a.User time

b.System time

c.Total CPU time, which is the sum of user and system time

d.Real (clock) time

e.Percent of real time used by CPU time

•core gives memory usage statistics for the pass, in this order:

a.The first item is always 0, and currently has no meaning.

b.The second item is the integral resident set size.

•The io section gives the volume of input and output operations, expressed in blocks.

•The pf section gives the amount of page faults, expressed in pages, in this order:

a.Page faults not requiring physical I/O

b.Page faults requiring physical I/O

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Pascal 4.0 User’s Guide