perf tweaks

C/README.md

@@ -10,6 +10,7 @@ This repository contains a few implementations of a simple botec (back-of-the-en
 
 - [ ] Add Windows/Powershell time-measuring commands
 - [ ] Add CUDA?
+- [x] Added results of perf. `rand_r` seems like a big chunk of it, but I'm hesitant to use lower-quality random numbers
 - [x] Update repository with correct timing
 - [x] Use better profiling approach to capture timing with 1M samples.
 - [x] See if program can be reworded so as to use multithreading effectively, e.g., so that you see speed gains proportional to the number of threads used

C/makefile

@@ -82,7 +82,7 @@ time-linux-simple:
 ## Profiling
 
 profile-linux: 
-	echo "Requires perf, which depends on the kernel, and might be in linux-tools package or similar"
+	echo "Requires perf, which depends on the kernel version, and might be in linux-tools package or similar"
 	echo "Must be run as sudo"
 	$(CC) $(SRC) $(OPENMP) $(MATH) -o $(OUTPUT)
 	# ./$(OUTPUT)

C/perf.txt

@@ -0,0 +1,25 @@
+Overhead  Command  Shared Object      Symbol
+  23.94%  samples  libc-2.31.so       [.] rand_r
+  18.14%  samples  libgomp.so.1.0.0   [.] 0x000000000001d132
+  15.43%  samples  libgomp.so.1.0.0   [.] 0x000000000001d2ea
+  12.16%  samples  samples            [.] mixture._omp_fn.0
+   4.36%  samples  libm-2.31.so       [.] __sin_fma
+   3.49%  samples  libm-2.31.so       [.] __ieee754_log_fma
+   3.34%  samples  samples            [.] random_to
+   3.13%  samples  samples            [.] random_uniform
+   2.77%  samples  samples            [.] split_array_sum._omp_fn.0
+   2.01%  samples  samples            [.] rand_float
+   1.65%  samples  libm-2.31.so       [.] __logf_fma
+   0.88%  samples  libgomp.so.1.0.0   [.] 0x000000000001d2f5
+   0.86%  samples  samples            [.] ur_normal
+   0.75%  samples  libm-2.31.so       [.] __expf_fma
+   0.70%  samples  libgomp.so.1.0.0   [.] 0x000000000001d13d
+   0.69%  samples  libgomp.so.1.0.0   [.] 0x000000000001d139
+   0.57%  samples  libgomp.so.1.0.0   [.] 0x000000000001d2f1
+   0.57%  samples  samples            [.] sample_1
+   0.55%  samples  samples            [.] random_lognormal
+   0.50%  samples  [kernel.kallsyms]  [k] asm_exc_page_fault
+   0.49%  samples  [kernel.kallsyms]  [k] clear_page_rep
+   0.47%  samples  samples            [.] random_normal
+   0.38%  samples  [kernel.kallsyms]  [k] default_send_IPI_single_phys
+