cmd, eth, ethdb, node: prioritise chaindata for resources, bump cache

cmd/utils/fdlimit_test.go

@@ -0,0 +1,35 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package utils
+
+import "testing"
+
+// TestFileDescriptorLimits simply tests whether the file descriptor allowance
+// per this process can be retrieved.
+func TestFileDescriptorLimits(t *testing.T) {
+	target := 4096
+
+	if limit, err := getFdLimit(); err != nil || limit <= 0 {
+		t.Fatalf("failed to retrieve file descriptor limit (%d): %v", limit, err)
+	}
+	if err := raiseFdLimit(uint64(target)); err != nil {
+		t.Fatalf("failed to raise file allowance")
+	}
+	if limit, err := getFdLimit(); err != nil || limit < target {
+		t.Fatalf("failed to retrieve raised descriptor limit (have %v, want %v): %v", limit, target, err)
+	}
+}