benchmark: make temp file path configurable

In three fs benchmarks, a temp file is created in the source tree. For
tests, allow the location to be configurable so it gets written to the
test temp directory instead.

Additionally, shave about a second off the test running time by setting
`dur` to `0.1` instead of `1`.

PR-URL: #17811
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

benchmark/fs/read-stream-throughput.js

@@ -3,7 +3,7 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(__dirname,
+const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
                               `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 const assert = require('assert');

benchmark/fs/readfile.js

@@ -5,7 +5,7 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(__dirname,
+const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
                               `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 

benchmark/fs/write-stream-throughput.js

@@ -3,7 +3,7 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(__dirname,
+const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
                               `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 

test/parallel/test-benchmark-fs.js

@@ -1,17 +1,17 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 const runBenchmark = require('../common/benchmark');
 
 runBenchmark('fs', [
   'n=1',
   'size=1',
-  'dur=1',
+  'dur=0.1',
   'len=1024',
   'concurrent=1',
   'pathType=relative',
   'statType=fstat',
   'statSyncType=fstatSync',
   'encodingType=buf',
   'filesize=1024'
-]);
+], { NODE_TMPDIR: common.tmpDir });