57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package main
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import (
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"crypto/sha256"
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"fmt"
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"net/http"
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"strconv"
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"sync"
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"time"
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)
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var BuildTime string
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const ramChunkSize = 100 * 1024 * 1024 // 0.1 GiB
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var (
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ramMu sync.Mutex
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ramChunks [][]byte
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)
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func main() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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_, _ = fmt.Fprintln(w, BuildTime)
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})
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http.HandleFunc("/ram", func(w http.ResponseWriter, r *http.Request) {
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chunk := make([]byte, ramChunkSize)
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for i := range chunk {
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chunk[i] = 1
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}
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ramMu.Lock()
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ramChunks = append(ramChunks, chunk)
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total := len(ramChunks)
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ramMu.Unlock()
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w.WriteHeader(http.StatusOK)
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_, _ = fmt.Fprintf(w, "allocated 0.1 GiB, total held: %.1f GiB (%d chunks)\n", float64(total)*0.1, total)
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})
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http.HandleFunc("/cpu", func(w http.ResponseWriter, r *http.Request) {
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iterations := 1_000_000
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if n, err := strconv.Atoi(r.URL.Query().Get("n")); err == nil && n > 0 {
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iterations = n
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}
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start := time.Now()
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sum := sha256.Sum256([]byte("zerops"))
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for i := 0; i < iterations; i++ {
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sum = sha256.Sum256(sum[:])
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}
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elapsed := time.Since(start)
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w.WriteHeader(http.StatusOK)
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_, _ = fmt.Fprintf(w, "computed %x in %s (%d iterations)\n", sum, elapsed, iterations)
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})
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_ = http.ListenAndServe(":8080", nil)
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}
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