From dbcd2f6dc2a4b842ebcfa5dbfc7990befa27267c Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Tue, 18 Mar 2025 22:32:53 +0200
Subject: add race detector

---
 Makefile                          | 3 +++
 internal/flamegraph/flamegraph.go | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index fe8d281..3935361 100644
--- a/Makefile
+++ b/Makefile
@@ -25,6 +25,8 @@ generate:
 .PHONY: gobuild
 gobuild:
 	$(GO) build -tags netgo -ldflags '-w -extldflags "-static"' -o ior ./cmd/ior/main.go
+gobuild_race:
+	$(GO) build -tags netgo -ldflags '-w -extldflags "-static"' -race -o ior ./cmd/ior/main.go
 
 .PHONY: clean
 clean:
@@ -69,3 +71,4 @@ inferno:
 prof:
 	$(GO) tool pprof -pdf ./ior ior.cpuprofile > cpuprofile.pdf && evince cpuprofile.pdf &
 	$(GO) tool pprof -pdf ./ior ior.memprofile > memprofile.pdf && evince memprofile.pdf &
+	
diff --git a/internal/flamegraph/flamegraph.go b/internal/flamegraph/flamegraph.go
index 223389d..d5d7e96 100644
--- a/internal/flamegraph/flamegraph.go
+++ b/internal/flamegraph/flamegraph.go
@@ -21,7 +21,11 @@ func New() Flamegraph {
 		Ch:   make(chan *event.Pair, 4096),
 		Done: make(chan struct{}),
 	}
-	for range runtime.NumCPU() / 2 {
+	numWorkers := runtime.NumCPU() / 4
+	if numWorkers == 0 {
+		numWorkers = 1
+	}
+	for range numWorkers {
 		f.workers = append(f.workers, newWorker())
 	}
 	return f
-- 
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