benchmark: use test/common/tmpdir consistently

Many benchmarks use test/common/tmpdir. This changes 3 benchmarks that
use NODE_TMPDIR to also use test/common/tmpdir.

This is necessary in preparation for the next commit that changes tmpdir
to delete tmpdir.path when the Node.js process exits. Thus, if multiple
benchmarks are run sequentially, the ones that use tmpdir will remove
the directory and the ones changed here would fail because it does not
exist. This happens when running test/benchmark.

Note: to explicitly select a directory for tmpdir, use NODE_TEST_DIR.

PR-URL: #28858
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

benchmark/fs/read-stream-throughput.js

@@ -3,11 +3,14 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
-                              `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 const assert = require('assert');
 
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = path.resolve(tmpdir.path,
+                              `.removeme-benchmark-garbage-${process.pid}`);
+
 let encodingType, encoding, size, filesize;
 
 const bench = common.createBenchmark(main, {

benchmark/fs/readfile.js

@@ -5,11 +5,14 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
-                              `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 const assert = require('assert');
 
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = path.resolve(tmpdir.path,
+                              `.removeme-benchmark-garbage-${process.pid}`);
+
 const bench = common.createBenchmark(main, {
   dur: [5],
   len: [1024, 16 * 1024 * 1024],

benchmark/fs/write-stream-throughput.js

@@ -3,10 +3,13 @@
 
 const path = require('path');
 const common = require('../common.js');
-const filename = path.resolve(process.env.NODE_TMPDIR || __dirname,
-                              `.removeme-benchmark-garbage-${process.pid}`);
 const fs = require('fs');
 
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = path.resolve(tmpdir.path,
+                              `.removeme-benchmark-garbage-${process.pid}`);
+
 const bench = common.createBenchmark(main, {
   dur: [5],
   encodingType: ['buf', 'asc', 'utf'],

test/benchmark/test-benchmark-fs.js

@@ -19,4 +19,4 @@ runBenchmark('fs', [
   'filesize=1024',
   'dir=.github',
   'withFileTypes=false'
-], { NODE_TMPDIR: tmpdir.path, NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });
+], { NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });