diff --git a/bench/Makefile b/bench/Makefile
index 3d8b23c8..7143f1cc 100644
--- a/bench/Makefile
+++ b/bench/Makefile
@@ -1,27 +1,28 @@
-SOLVER =../sat_solve.native
-OPTIONS =-t 30s -s 1G
-CMD = $(SOLVER) $(OPTIONS)
+SOLVER 	:=../sat_solve.native
+OPTIONS :=-t 30s -s 1G
 
-LOGDIR := logs
-LOG := $(shell  date +'$(LOGDIR)/sat_%Y-%m-%d-%H%M')
-CNF := $(shell  find ./ -name "*.cnf" -type f)
-DONE := $(CNF:.cnf=.done)
+LOGDIR 	:= $(shell echo "logs/`git rev-parse HEAD`")
+LOGDIRE := $(shell echo "logs\/`git rev-parse HEAD`")
+INDEX	:= $(shell echo "$(LOGDIR)/index")
+CNF 	:= $(shell find ./ -name "*.cnf" -type f)
+DONE 	:= $(addprefix $(LOGDIR)/raw/, $(CNF:.cnf=.done))
 
-all: $(LOG) $(DONE)
-	@find ./ -name "*.done" -type f -delete
+PROVER := $(shell echo "$(LOGDIR)/prover")
+CMD    := $(PROVER) $(OPTIONS)
+
+all: $(INDEX)
 	@echo "All done."
 
-$(LOG):
-	@mkdir -p $(LOGDIR)
-	@touch $(LOG)
-	@echo "Log file : $(LOG)"
-	@echo "Date : `date +'%H:%M %d-%m-%Y'`" | tee -a $(LOG)
-	@echo "Command : '$(CMD)'" | tee -a $(LOG)
-	@echo "Commit : `git rev-parse HEAD`" | tee -a $(LOG)
+$(INDEX): $(PROVER) $(DONE)
+	@echo "Ended at `date +'%H:%M:%S %d/%m/%Y'`" > $(INDEX)
+	@echo "Index created"
 
-%.done : %.cnf $(LOG)
-	@./run_prover "$(CMD)" "$*" "$(LOG)"
-	@touch $*.done
+$(PROVER):
+	@echo "Creating log directory..." && mkdir -p $(LOGDIR)/raw
+	@echo "Copying prover..." && cp $(SOLVER) $(PROVER)
+
+$(LOGDIR)/raw/%.done : $(PROVER)
+	@mkdir -p $(dir $@)
+	@echo "solving problem $*.cnf..."
+	@./run_prover "$(CMD)" "$*.cnf" "$@"
 
-clean:
-	@find ./ -name "*.done" -type f -delete
diff --git a/bench/run b/bench/run
deleted file mode 100755
index 2620a11e..00000000
--- a/bench/run
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/bin/bash
-
-CURDIR=`dirname $0`
-SOLVER="$CURDIR/../sat_solve.native"
-
-solvertest () {
-    for f in `find -L $1 -name *.cnf -type f`
-    do
-        echo -ne "\r\033[KTesting $f..."
-        "$SOLVER" -t 5s -s 1G $f | grep $2 > /dev/null 2> /dev/null
-        RET=$?
-        if [ $RET -ne 0 ];
-        then
-            echo -e "\r\033[K\e[31m[KO]\e[0m $f"
-            exit 2
-        fi
-    done
-    echo -e "\r\033[K\e[32m[OK]\e[0m $2"
-}
-
-all () {
-    solvertest "$CURDIR/flatgraph/" "Sat"
-    solvertest "$CURDIR/morphgraph/" "Sat"
-}
-
-time all
diff --git a/bench/run_prover b/bench/run_prover
index aa8712bf..77e420cd 100755
--- a/bench/run_prover
+++ b/bench/run_prover
@@ -1,7 +1,12 @@
 #!/bin/bash
 
-CMD="$0"
-FILE="$1"
-LOG="$2"
+CMD="$1"
+FILE="$2"
+LOG="$3"
 
-sleep 1
+/usr/bin/time -f "%e" $CMD $FILE > $3 2>&1
+RET=$?
+if [ $RET -ne 0 ];
+then
+    echo "Error code $RET while solving $FILE"
+fi