Fix local system as remote machine issue #1852 (#1856)

* Fix local system as remote machine issue #1852

src/nni_manager/training_service/remote_machine/remoteMachineTrainingService.ts

@@ -442,7 +442,7 @@ class RemoteMachineTrainingService implements TrainingService {
             async (tick: number) => {
                 const cmdresult: RemoteCommandResult = await SSHClientUtility.remoteExeCommand(
                     `tail -n 1 ${unixPathJoin(remoteGpuScriptCollectorDir, 'gpu_metrics')}`, conn);
-                if (cmdresult !== undefined && cmdresult.stdout !== undefined) {
+                if (cmdresult !== undefined && cmdresult.stdout !== undefined && cmdresult.stdout.length > 0) {
                     rmMeta.gpuSummary = <GPUSummary>JSON.parse(cmdresult.stdout);
                     if (rmMeta.gpuSummary.gpuCount === 0) {
                         this.log.warning(`No GPU found on remote machine ${rmMeta.ip}`);

src/nni_manager/training_service/remote_machine/sshClientUtility.ts

@@ -101,10 +101,9 @@ export namespace SSHClientUtility {
      * @param sshClient SSH client
      */
     export async function copyDirectoryToRemote(localDirectory: string, remoteDirectory: string, sshClient: Client, remoteOS: string): Promise<void> {
-        const deferred: Deferred<void> = new Deferred<void>();
-        const tmpTarName: string = `${uniqueString(10)}.tar.gz`;
-        const localTarPath: string = path.join(os.tmpdir(), tmpTarName);
-        const remoteTarPath: string = unixPathJoin(getRemoteTmpDir(remoteOS), tmpTarName);
+        const tmpSuffix: string = uniqueString(5);
+        const localTarPath: string = path.join(os.tmpdir(), `nni_tmp_local_${tmpSuffix}.tar.gz`);
+        const remoteTarPath: string = unixPathJoin(getRemoteTmpDir(remoteOS), `nni_tmp_remote_${tmpSuffix}.tar.gz`);
 
         // Compress files in local directory to experiment root directory
         await tarAdd(localTarPath, localDirectory);
@@ -114,9 +113,6 @@ export namespace SSHClientUtility {
         // Decompress the remote compressed file in and delete it
         await remoteExeCommand(`tar -oxzf ${remoteTarPath} -C ${remoteDirectory}`, sshClient);
         await remoteExeCommand(`rm ${remoteTarPath}`, sshClient);
-        deferred.resolve();
-
-        return deferred.promise;
     }
 
     export function getRemoteFileContent(filePath: string, sshClient: Client): Promise<string> {