diskBuckets := set.CreateStringSet()
			for _, bucket := range buckets {
				diskBuckets.Add(bucket.Name)
			}
			sys.RemoveStaleBuckets(diskBuckets)

			for i := range buckets {
				wait := sleeper.Timer(ctx)

				meta, err := loadBucketMetadata(ctx, sys.objAPI, buckets[i].Name)
				if err != nil {
					internalLogIf(ctx, err, logger.WarningKind)
					wait() // wait to proceed to next entry.
					continue
				}

			w, _ := zw.CreateHeader(&FileHeader{
				Name:   "foo",
				Method: Deflate,
			})
			w.Write(bigBuf)
		}
		zw.Close()
	}

	b.ReportAllocs()
	// Run once and then reset the timer.
	// This effectively discards the very large initial flate setup cost,
	// as well as the initialization of bigBuf.
	runOnce(&bytes.Buffer{})
	b.ResetTimer()

	b.RunParallel(func(pb *testing.PB) {

		return context.DeadlineExceeded
	}
}

// NewDeadlineWriter wraps a writer to make it respect given deadline
// value per Write(). If there is a blocking write, the returned Writer
// will return whenever the timer hits (the return values are n=0
// and err=context.DeadlineExceeded.)
func NewDeadlineWriter(w io.WriteCloser, timeout time.Duration) io.WriteCloser {
	return &DeadlineWriter{WriteCloser: w, timeout: timeout}
}