diff --git a/.github/workflows/demo_test.yml b/.github/workflows/demo_test.yml
index d373896f..e89229a4 100644
--- a/.github/workflows/demo_test.yml
+++ b/.github/workflows/demo_test.yml
@@ -1289,3 +1289,22 @@ jobs:
     
     - name: Clean Swtpm test
       run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos && rm -rf ./swtpm"
+
+
+  Filebench_test:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+
+    - uses: ./.github/workflows/composite_action/sim
+      with:
+        container-name: ${{ github.job }}
+        build-envs: 'OCCLUM_RELEASE_BUILD=1'
+
+    - name: Preinstall dependencies and build Filebench
+      run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/benchmarks/filebench && ./preinstall_deps.sh && ./dl_and_build_filebench.sh"
+
+    - name: Prepare occlum instance and Run Filebench on Ext2
+      run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/benchmarks/filebench && SGX_MODE=SIM ./run_workload.sh readfiles"
diff --git a/demos/benchmarks/filebench/.gitignore b/demos/benchmarks/filebench/.gitignore
new file mode 100644
index 00000000..4ecd517b
--- /dev/null
+++ b/demos/benchmarks/filebench/.gitignore
@@ -0,0 +1,3 @@
+filebench
+filebench*.tar.gz
+occlum_instance
diff --git a/demos/benchmarks/filebench/README.md b/demos/benchmarks/filebench/README.md
new file mode 100644
index 00000000..c91e095e
--- /dev/null
+++ b/demos/benchmarks/filebench/README.md
@@ -0,0 +1,25 @@
+## Run Filebench on Occlum
+
+[Filebench](https://github.com/Filebench/Filebench) is a benchmark tool aiming to test the file system and the storage system under certain workloads. This demo demonstrates how can Filebench run on Occlum.
+
+### Step 1: Preinstall dependencies
+Related dependencies: bison flex
+```
+cd demos/benchmarks/filebench && ./preinstall_deps.sh
+```
+
+### Step 2: Build Filebench from source
+```
+cd demos/benchmarks/filebench && ./dl_and_build_Filebench.sh
+```
+
+The script will download the source code, make some adaptation then compile Filebench into a binary.
+
+### Step 3: Run Filebench workloads
+```
+cd demos/benchmarks/filebench && ./run_workload.sh <workload_name>
+```
+
+The script will run user-specific workloads under `filebench/workloads`. The corresponding results will be outputed.
+
+Refer to [Filebench/wiki/Workload-model-language](https://github.com/Filebench/Filebench/wiki/Workload-model-language) and see more information about workloads.
diff --git a/demos/benchmarks/filebench/apply-filebench-to-occlum.patch b/demos/benchmarks/filebench/apply-filebench-to-occlum.patch
new file mode 100644
index 00000000..43556128
--- /dev/null
+++ b/demos/benchmarks/filebench/apply-filebench-to-occlum.patch
@@ -0,0 +1,63 @@
+diff --color -ruN filebench/config.h modify/config.h
+--- filebench/config.h	2022-05-10 11:24:44.393676003 +0800
++++ modify/config.h	2022-05-10 11:15:23.769794727 +0800
+@@ -295,6 +295,7 @@
+ 
+ /* Define if you have SYSV sems */
+ #define HAVE_SYSV_SEM 1
++#undef HAVE_SYSV_SEM
+ 
+ /* Define to 1 if you have the <sys/dir.h> header file, and it defines `DIR'.
+    */
+diff --color -ruN filebench/ipc.c modify/ipc.c
+--- filebench/ipc.c	2022-05-10 11:24:44.393676003 +0800
++++ modify/ipc.c	2022-05-10 11:16:06.768145518 +0800
+@@ -400,21 +400,22 @@
+ int
+ ipc_attach(void *shmaddr, char *shmpath)
+ {
+-	int shmfd;
++	// int shmfd;
+ 
+-	if ((shmfd = open(shmpath, O_RDWR)) < 0) {
+-		filebench_log(LOG_FATAL, "Could not open shared memory "
+-			      "file %s: %s", shmpath, strerror(errno));
+-		return (-1);
+-	}
++	// if ((shmfd = open(shmpath, O_RDWR)) < 0) {
++	// 	filebench_log(LOG_FATAL, "Could not open shared memory "
++	// 		      "file %s: %s", shmpath, strerror(errno));
++	// 	return (-1);
++	// }
+ 
+-	if ((filebench_shm = (filebench_shm_t *)mmap(shmaddr,
+-	    sizeof (filebench_shm_t), PROT_READ | PROT_WRITE,
+-	    MAP_SHARED | MAP_FIXED, shmfd, 0)) == MAP_FAILED) {
+-		filebench_log(LOG_FATAL, "Could not mmap the shared "
+-		"memory file: %s", strerror(errno));
+-		return (-1);
+-	}
++	// if ((filebench_shm = (filebench_shm_t *)mmap(shmaddr,
++	//     sizeof (filebench_shm_t), PROT_READ | PROT_WRITE,
++	//     MAP_SHARED | MAP_FIXED, shmfd, 0)) == MAP_FAILED) {
++	// 	filebench_log(LOG_FATAL, "Could not mmap the shared "
++	// 	"memory file: %s", strerror(errno));
++	// 	return (-1);
++	// }
++	filebench_shm = (filebench_shm_t *)shmaddr;
+ 
+ 	if (filebench_shm != shmaddr) {
+ 		filebench_log(LOG_FATAL, "Could not mmap the shared "
+diff --color -ruN filebench/procflow.c modify/procflow.c
+--- filebench/procflow.c	2022-05-10 11:24:44.393676003 +0800
++++ modify/procflow.c	2022-05-10 11:16:35.772217279 +0800
+@@ -90,7 +90,8 @@
+ 		return (-1);
+ 	}
+ #else
+-	if ((pid = fork()) < 0) {
++	// if ((pid = fork()) < 0) {
++	if ((pid = vfork()) < 0) {
+ 		filebench_log(LOG_ERROR,
+ 		    "procflow_createproc fork failed: %s",
+ 		    strerror(errno));
diff --git a/demos/benchmarks/filebench/dl_and_build_filebench.sh b/demos/benchmarks/filebench/dl_and_build_filebench.sh
new file mode 100755
index 00000000..763d660a
--- /dev/null
+++ b/demos/benchmarks/filebench/dl_and_build_filebench.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+set -e
+
+BLUE='\033[1;34m'
+NC='\033[0m'
+echo -e "${BLUE}Start building filebench from tarball.${NC}"
+
+# Download release tarball
+VERSION="1.5-alpha3"
+TARBALL="filebench-${VERSION}.tar.gz"
+rm -f ${TARBALL}
+wget https://github.com/filebench/filebench/releases/download/${VERSION}/${TARBALL}
+rm -rf filebench && mkdir filebench
+tar -zxvf filebench-${VERSION}.tar.gz -C filebench --strip-components 1
+pushd filebench
+
+./configure
+popd
+
+# Make modification to
+# 1. Replace fork to vfork
+# 2. Prepare shared memory region for child processes
+# 3. Disable SYSV semaphores
+patch -s -p0 < apply-filebench-to-occlum.patch
+
+pushd filebench
+# Build and install filebench tool
+make -j$(nproc)
+make install
+echo -e "${BLUE}Finish building filebench from tarball.${NC}"
+
+popd
diff --git a/demos/benchmarks/filebench/filebench.yaml b/demos/benchmarks/filebench/filebench.yaml
new file mode 100644
index 00000000..523f70c0
--- /dev/null
+++ b/demos/benchmarks/filebench/filebench.yaml
@@ -0,0 +1,18 @@
+includes:
+  - base.yaml
+# filebench
+targets:
+  # copy filebench, bash and busybox
+  - target: /bin
+    copy:
+      - files:
+        - /usr/local/bin/filebench
+  # copy workload files
+  - target: /
+    copy:
+      - dirs:
+        - ../workloads
+  - target: /opt/occlum/glibc/lib
+    copy:
+      - files:
+        - /lib/x86_64-linux-gnu/libgcc_s.so.1
diff --git a/demos/benchmarks/filebench/preinstall_deps.sh b/demos/benchmarks/filebench/preinstall_deps.sh
new file mode 100755
index 00000000..d0deea1a
--- /dev/null
+++ b/demos/benchmarks/filebench/preinstall_deps.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+set -e
+
+BLUE='\033[1;34m'
+NC='\033[0m'
+echo -e "${BLUE}Start installing dependencies.${NC}"
+
+DEPS="bison flex"
+
+OS=`awk -F= '/^NAME/{print $2}' /etc/os-release`
+if [ "$OS" == "\"Ubuntu\"" ]; then
+  apt-get update -y && apt-get install -y ${DEPS}
+else
+  echo "Unsupported OS: $OS"
+  exit 1
+fi
+
+echo -e "${BLUE}Finish installing dependencies.${NC}"
diff --git a/demos/benchmarks/filebench/run_workload.sh b/demos/benchmarks/filebench/run_workload.sh
new file mode 100755
index 00000000..3a055e4c
--- /dev/null
+++ b/demos/benchmarks/filebench/run_workload.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+set -e
+
+WORKLOAD_LIST=("readfiles" "videoserver" "fileserver" "varmail" "oltp")
+# More about workload model language at
+# https://github.com/filebench/filebench/wiki/Workload-model-language
+
+WORKLOAD_FILE=$1
+if [[ ! " ${WORKLOAD_LIST[@]} "  =~ " ${WORKLOAD_FILE} " ]]; then
+  echo "Please select a workload from: readfiles | videoserver | fileserver | varmail | oltp"
+  exit
+fi
+
+# 1. Init Occlum Workspace
+rm -rf occlum_instance && occlum new occlum_instance
+cd occlum_instance
+
+# Enlarge "kernel_space_heap_size" when "pre-allocating files failed" occurs
+# Enlarge "user_space_size" when "procflow exec proc failed" occurs
+TCS_NUM=$(($(nproc) * 2))
+new_json="$(jq --argjson THREAD_NUM ${TCS_NUM} '.resource_limits.user_space_size="2000MB" |
+    .resource_limits.kernel_space_heap_max_size="1000MB" |
+    .resource_limits.max_num_of_threads = $THREAD_NUM |
+    .mount += [{"target": "/ext2", "type": "ext2", "options": {"disk_size": "10GB"}}]' Occlum.json)" && \
+echo "${new_json}" > Occlum.json
+
+# 2. Copy files into Occlum Workspace and build
+rm -rf image
+copy_bom -f ../filebench.yaml --root image --include-dir /opt/occlum/etc/template
+
+occlum build
+
+# 3. Run benchmark under different workloads
+BLUE='\033[1;34m'
+NC='\033[0m'
+echo -e "${BLUE}Run filebench on Occlum.${NC}"
+
+occlum run /bin/filebench -f /workloads/${WORKLOAD_FILE}.f
diff --git a/demos/benchmarks/filebench/workloads/fileserver.f b/demos/benchmarks/filebench/workloads/fileserver.f
new file mode 100644
index 00000000..08b4c41c
--- /dev/null
+++ b/demos/benchmarks/filebench/workloads/fileserver.f
@@ -0,0 +1,56 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+#
+# Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+set $dir=/ext2/fbtest_ext2
+set $nfiles=10000
+set $meandirwidth=20
+set $filesize=128k
+set $nthreads=16
+set $iosize=1m
+set $meanappendsize=16k
+
+define fileset name=bigfileset,path=$dir,size=$filesize,entries=$nfiles,dirwidth=$meandirwidth,prealloc=80
+
+define process name=filereader,instances=1
+{
+  thread name=filereaderthread,memsize=10m,instances=$nthreads
+  {
+    flowop createfile name=createfile1,filesetname=bigfileset,fd=1
+    flowop writewholefile name=wrtfile1,srcfd=1,fd=1,iosize=$iosize
+    flowop closefile name=closefile1,fd=1
+    flowop openfile name=openfile1,filesetname=bigfileset,fd=1
+    flowop appendfilerand name=appendfilerand1,iosize=$meanappendsize,fd=1
+    flowop closefile name=closefile2,fd=1
+    flowop openfile name=openfile2,filesetname=bigfileset,fd=1
+    flowop readwholefile name=readfile1,fd=1,iosize=$iosize
+    flowop closefile name=closefile3,fd=1
+    flowop deletefile name=deletefile1,filesetname=bigfileset
+    flowop statfile name=statfile1,filesetname=bigfileset
+  }
+}
+
+echo  "File-server Version 3.0 personality successfully loaded"
+
+run 60
diff --git a/demos/benchmarks/filebench/workloads/oltp.f b/demos/benchmarks/filebench/workloads/oltp.f
new file mode 100644
index 00000000..7e6f8f29
--- /dev/null
+++ b/demos/benchmarks/filebench/workloads/oltp.f
@@ -0,0 +1,82 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+#
+# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+# Workload "oltp" from filebench cannot run directly on Occlum
+# since aio write/wait and semaphore-related flowops are not supported.
+# We replace some flowops to achieve similar performance quota.
+
+set $dir=/root/fbtest
+set $eventrate=0
+set $iosize=2k
+set $nshadows=200
+set $ndbwriters=10
+set $usermode=200000
+set $filesize=10m
+set $memperthread=1m
+set $workingset=0
+set $logfilesize=10m
+set $nfiles=10
+set $nlogfiles=1
+set $directio=0
+eventgen rate = $eventrate
+
+# Define a datafile and logfile
+define fileset name=datafiles,path=$dir,size=$filesize,entries=$nfiles,dirwidth=1024,prealloc=100,reuse
+define fileset name=logfile,path=$dir,size=$logfilesize,entries=$nlogfiles,dirwidth=1024,prealloc=100,reuse
+
+define process name=lgwr,instances=1
+{
+  thread name=lgwr,memsize=$memperthread
+  {
+    flowop write name=lg-write,filesetname=logfile,
+        iosize=256k,random,directio=$directio,dsync
+  }
+}
+
+# Define database writer processes
+define process name=dbwr,instances=$ndbwriters
+{
+  thread name=dbwr,memsize=$memperthread
+  {
+    flowop write name=dbwrite-a,filesetname=datafiles,
+        iosize=$iosize,workingset=$workingset,random,iters=100,opennext,directio=$directio,dsync
+    flowop hog name=dbwr-hog,value=10000
+  }
+}
+
+define process name=shadow,instances=$nshadows
+{
+  thread name=shadow,memsize=$memperthread
+  {
+    flowop read name=shadowread,filesetname=datafiles,
+        iosize=$iosize,workingset=$workingset,random,opennext,directio=$directio
+    flowop hog name=shadowhog,value=$usermode
+    flowop eventlimit name=random-rate
+  }
+}
+
+echo "OLTP Version 3.0  personality successfully loaded"
+
+run 60
diff --git a/demos/benchmarks/filebench/workloads/readfiles.f b/demos/benchmarks/filebench/workloads/readfiles.f
new file mode 100644
index 00000000..018f4756
--- /dev/null
+++ b/demos/benchmarks/filebench/workloads/readfiles.f
@@ -0,0 +1,11 @@
+# A simple readfiles workload
+
+define fileset name="testF",entries=16,filesize=4k,path="/ext2/fbtest_ext2",prealloc
+define process name="readerP",instances=1 {
+thread name="readerT",instances=1 {
+    flowop openfile name="openOP",filesetname="testF"
+    flowop readwholefile name="readOP",filesetname="testF"
+    flowop closefile name="closeOP"
+}
+}
+run 30
diff --git a/demos/benchmarks/filebench/workloads/varmail.f b/demos/benchmarks/filebench/workloads/varmail.f
new file mode 100644
index 00000000..bb68f84d
--- /dev/null
+++ b/demos/benchmarks/filebench/workloads/varmail.f
@@ -0,0 +1,60 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+#
+# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+# flowop openfile name=openfile2,filesetname=bigfileset,fd=1
+#
+
+set $dir=/root/fbtest
+set $nfiles=8000
+set $meandirwidth=1000
+set $filesize=16k
+set $nthreads=16
+set $iosize=1m
+set $meanappendsize=16k
+
+define fileset name=bigfileset,path=$dir,size=$filesize,entries=$nfiles,dirwidth=$meandirwidth,prealloc=80
+
+define process name=filereader,instances=1
+{
+  thread name=filereaderthread,memsize=10m,instances=$nthreads
+  {
+    flowop deletefile name=deletefile1,filesetname=bigfileset
+    flowop createfile name=createfile2,filesetname=bigfileset,fd=1
+    flowop appendfilerand name=appendfilerand2,iosize=$meanappendsize,fd=1
+    flowop fsync name=fsyncfile2,fd=1
+    flowop closefile name=closefile2,fd=1
+    flowop openfile name=openfile3,filesetname=bigfileset,fd=1
+    flowop readwholefile name=readfile3,fd=1,iosize=$iosize
+    flowop appendfilerand name=appendfilerand3,iosize=$meanappendsize,fd=1
+    flowop fsync name=fsyncfile3,fd=1
+    flowop closefile name=closefile3,fd=1
+    flowop openfile name=openfile4,filesetname=bigfileset,fd=1
+    flowop readwholefile name=readfile4,fd=1,iosize=$iosize
+    flowop closefile name=closefile4,fd=1
+  }
+}
+
+echo  "Varmail Version 3.0 personality successfully loaded"
+
+run 60
diff --git a/demos/benchmarks/filebench/workloads/videoserver.f b/demos/benchmarks/filebench/workloads/videoserver.f
new file mode 100644
index 00000000..478000ef
--- /dev/null
+++ b/demos/benchmarks/filebench/workloads/videoserver.f
@@ -0,0 +1,76 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+#
+# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+# This workloads emulates a video server. It has two filesets, one of videos
+# being actively served, and one of videos availabe but currently inactive
+# (passive). However, one thread, vidwriter, is writing new videos to replace
+# no longer viewed videos in the passive set. Meanwhile $nthreads threads are
+# serving up videos from the activevids fileset. If the desired rate is R mb/s,
+# and $nthreads is set to T, then set the $srvbwrate to R * T to get the
+# desired rate per video stream. The video replacement rate of one video
+# file per replacement interval, is set by $repintval which defaults to
+# 1 second. Thus the write bandwidth will be set as $filesize/$repintval.
+#
+
+set $dir=/root/fbtest
+set $eventrate=96
+set $filesize=1g
+set $nthreads=48
+set $numactivevids=5
+set $numpassivevids=30
+set $reuseit=false
+set $readiosize=256k
+set $writeiosize=1m
+set $passvidsname=passivevids
+set $actvidsname=activevids
+set $repintval=10
+eventgen rate=$eventrate
+
+define fileset name=$actvidsname,path=$dir,size=$filesize,entries=$numactivevids,dirwidth=4,prealloc,paralloc,reuse=$reuseit
+define fileset name=$passvidsname,path=$dir,size=$filesize,entries=$numpassivevids,dirwidth=20,prealloc=50,paralloc,reuse=$reuseit
+
+define process name=vidwriter,instances=1
+{
+  thread name=vidwriter,memsize=10m,instances=1
+  {
+    flowop deletefile name=vidremover,filesetname=$passvidsname
+    flowop createfile name=wrtopen,filesetname=$passvidsname,fd=1
+    flowop writewholefile name=newvid,iosize=$writeiosize,fd=1,srcfd=1
+    flowop closefile name=wrtclose, fd=1
+    flowop delay name=replaceinterval, value=$repintval
+  }
+}
+
+define process name=vidreaders,instances=1
+{
+  thread name=vidreaders,memsize=10m,instances=$nthreads
+  {
+    flowop read name=vidreader,filesetname=$actvidsname,iosize=$readiosize
+    flowop bwlimit name=serverlimit, target=vidreader
+  }
+}
+
+echo  "Video Server Version 3.0 personality successfully loaded"
+
+run 60