Makefile example for running multiple jobs

Makefile

# RUN ALL THIS IN AN EMPTY DIR!

# Run in parallel
MAKEFLAGS += -j4

# Simulation variables.
MSG = "Hello"
PARAMS := 100 1000 10000
#PARAMS := $(shell seq 1 10) # or something like this for params = 1, 2, ..., 10
SIMS := $(addprefix sim, $(PARAMS))
RESULTS_DIR := "results/"


# Simulation.
.PHONY: sims $(SIMS)

sims: $(SIMS)
	echo "Completed simulations."

# Note that each line is executed in a new shell. So, if you want to cd and then do something,
# make it in the same line.
$(SIMS): sim%:
	$(eval EXPERIMENT := $*)
	mkdir -p $(RESULTS_DIR)/$(EXPERIMENT)/
	cd $(RESULTS_DIR) && echo "$(MSG) $(EXPERIMENT)!" > $(EXPERIMENT)/out.txt


# Remove artifacts from simulations.
clean:
	rm -rf $(RESULTS_DIR)/*