diff --git a/tests/qps/Logging/LoggingClientCrossTests.php b/tests/qps/Logging/LoggingClientCrossTests.php
new file mode 100644
index 0000000000..845edf2fb8
--- /dev/null
+++ b/tests/qps/Logging/LoggingClientCrossTests.php
@@ -0,0 +1,96 @@
+<?php
+
+require dirname(__FILE__).'/../vendor/autoload.php';
+require dirname(__FILE__).'/../benchmark.php';
+use Google\Cloud\Logging\LoggingClient;
+
+function qps_client_main($arg_warm_up, $arg_benchmark, $payload)
+{
+    // Disable the batch so each request stands for a RPC
+    $grpcLogger = LoggingClient::psrBatchLogger(
+        'perf-gRPC',
+        [
+            'clientConfig' => [
+                'transport' => 'grpc'
+            ],
+            'batchOptions' => ['batchSize' => 1]
+        ]
+    );
+
+    $restLogger = LoggingClient::psrBatchLogger(
+        'perf-rest',
+        [
+            'clientConfig' => [
+                'transport' => 'rest'
+            ],
+            'batchOptions' => ['batchSize' => 1]
+        ]
+    );
+
+    $warm_up_time = $arg_warm_up;
+    $benchmark_time = $arg_benchmark;
+
+    $benchmark_count = 0;
+    $rest_latency_array = array();
+    $grpc_latency_array = array();
+    for ($i = 0; $i < count($payload); $i++) {
+        $rest_latency_array[$i] = array();
+        $grpc_latency_array[$i] = array();
+    }
+
+    // Warm up
+    $start_time = microtime(true);
+    echo "Start warmup...". PHP_EOL;
+    while(1) {
+        if (microtime(true) - $start_time > $warm_up_time) {
+            break;
+        }
+        $grpcLogger->info('a');
+        $restLogger->info('a');
+    }
+    // Benchmark
+    echo "Start benchmark...". PHP_EOL;
+    $start_time = microtime(true);
+    while(1) {
+        if (microtime(true) - $start_time > $benchmark_time) {
+            break;
+        }
+        $benchmark_count += 1;
+        for ($i = 0; $i < count($payload); $i++) {
+            $payload_size = $payload[$i];
+            $msg_grpc = generate_string($payload_size);
+            $msg_rest = generate_string($payload_size);
+
+            $grpc_start_time = microtime(true);
+            $grpcLogger->info($msg_grpc);
+            array_push($grpc_latency_array[$i], microtime(true) - $grpc_start_time);
+
+            $rest_start_time = microtime(true);
+            $restLogger->info($msg_rest);
+            array_push($rest_latency_array[$i], microtime(true) - $rest_start_time);
+        }
+    }
+
+    for ($i = 0; $i < count($payload); $i++) {
+        echo "=====================". PHP_EOL;
+        echo "payload: ". $payload[$i]. PHP_EOL;
+        echo "gRPC transport qps: " . ($benchmark_count / array_sum($grpc_latency_array[$i])) . PHP_EOL;
+        sort($grpc_latency_array[$i]);
+        print_stats("gRPC", $grpc_latency_array[$i]);
+
+        echo "rest transport qps: " . ($benchmark_count / array_sum($rest_latency_array[$i])) . PHP_EOL;
+        sort($rest_latency_array[$i]);
+        print_stats("REST", $rest_latency_array[$i]);
+    }
+}
+
+$arg_warmup = !empty($argv[1]) ? $argv[1] : 2;
+$arg_benchmark = !empty($argv[2]) ? $argv[2] : 40;
+$payload = array();
+if(!empty($argv[3])) {
+    $payload = array_map('intval', explode(',', $argv[3]));
+} else {
+    $payload = array(1, 10, 100, 1024, 10240);
+}
+qps_client_main($arg_warmup, $arg_benchmark, $payload);
+
diff --git a/tests/qps/Logging/logging_grpc.php b/tests/qps/Logging/logging_grpc.php
new file mode 100644
index 0000000000..3870af8595
--- /dev/null
+++ b/tests/qps/Logging/logging_grpc.php
@@ -0,0 +1,22 @@
+<?php
+use Google\Cloud\Logging\Logger;
+use Google\Cloud\Logging\LoggingClient;
+putenv("GOOGLE_APPLICATION_CREDENTIALS=./grpcwebtesting_key.json");
+require_once './vendor/autoload.php';
+
+$start_time = microtime(true);
+$grpcLogger = LoggingClient::psrBatchLogger(
+  'perf-grpc',
+  [
+    'clientConfig' => [
+      'transport' => 'grpc'
+    ],
+    'batchOptions' => ['batchSize' => 1]
+  ]
+);
+
+$grpcLogger->info('s');
+$first_latency = microtime(true) - $start_time;
+echo "rest latency for first RPC:". $first_latency. PHP_EOL;
+file_put_contents('logs_grpc.txt', $first_latency.PHP_EOL , FILE_APPEND | LOCK_EX);
+
diff --git a/tests/qps/Logging/logging_rest.php b/tests/qps/Logging/logging_rest.php
new file mode 100644
index 0000000000..97595350a7
--- /dev/null
+++ b/tests/qps/Logging/logging_rest.php
@@ -0,0 +1,21 @@
+<?php
+use Google\Cloud\Logging\Logger;
+use Google\Cloud\Logging\LoggingClient;
+putenv("GOOGLE_APPLICATION_CREDENTIALS=./grpcwebtesting_key.json");
+require_once './vendor/autoload.php';
+
+$start_time = microtime(true);
+$restLogger = LoggingClient::psrBatchLogger(
+     'perf-rest',
+     [
+         'clientConfig' => [
+             'transport' => 'rest'
+            ],
+            'batchOptions' => ['batchSize' => 1]
+        ]
+);
+
+$restLogger->info('e');
+$first_latency = microtime(true) - $start_time;
+echo "rest latency for first RPC:". $first_latency. PHP_EOL;
+file_put_contents('logs_rest.txt', $first_latency.PHP_EOL , FILE_APPEND | LOCK_EX);
diff --git a/tests/qps/benchmark.php b/tests/qps/benchmark.php
new file mode 100644
index 0000000000..7a12e994e4
--- /dev/null
+++ b/tests/qps/benchmark.php
@@ -0,0 +1,24 @@
+<?php
+
+function print_stats($name, $stats)
+{
+    echo "stats result for ". $name .PHP_EOL;
+    echo "Ave latency :". array_sum($stats)/max(count($stats), 1). PHP_EOL;
+    echo "50% latency :". $stats[count($stats)*0.5]. PHP_EOL;
+    echo "80% latency :". $stats[count($stats)*0.8]. PHP_EOL;
+    echo "90% latency :". $stats[count($stats)*0.9]. PHP_EOL;
+    echo "99% latency :". $stats[min(count($stats)*0.99, count($stats) - 1)]. PHP_EOL;
+}
+
+function generate_string($size)
+{
+    $seed = str_split('abcdefghijklmnopqrstuvwxyz'
+        .'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+        .'0123456789!@#$%^&*()');
+    $str_res = '';
+    for($i=0; $i<$size; $i++) {
+        $k = rand(0,71);
+        $str_res .= $seed[$k];
+    }
+    return $str_res;
+}
diff --git a/tests/qps/composer.json b/tests/qps/composer.json
new file mode 100644
index 0000000000..e8980d7990
--- /dev/null
+++ b/tests/qps/composer.json
@@ -0,0 +1,8 @@
+{
+    "require": {
+        "google/cloud": "^0.62.0",
+        "ext-json": "*",
+        "ext-protobuf": "*",
+	"ext-curl": "*"
+    }
+}
diff --git a/tests/qps/run_fpm_test.sh b/tests/qps/run_fpm_test.sh
new file mode 100644
index 0000000000..40d676775f
--- /dev/null
+++ b/tests/qps/run_fpm_test.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# LoggingClient
+for i in {1..100}
+do
+  curl -I localhost/logging_rest.php
+  curl -I localhost/logging_grpc.php
+done
diff --git a/tests/qps/run_test.sh b/tests/qps/run_test.sh
new file mode 100644
index 0000000000..4740d013af
--- /dev/null
+++ b/tests/qps/run_test.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# LoggingClient
+php -d extension=grpc.so -d extension=protobuf.so Logging/LoggingClientCrossTests.php 40 80 1024
+
+