-tracename: to set trace file name
you put the executable file name after "--" and "space"

If you want to generate a trace from any binary file such as "matrixmul"

../../../pin -t obj-intel64/sim.so -writetrace 1 -printinst 0  -tracename  newtrace.pzip  -- matrixmul

If the binary takes input arguments such as "matrixmu 10 10"


../../../pin -t obj-intel64/sim.so -writetrace 1 -printinst 0  -tracename  newtrace.pzip  -- matrixmul  10 10