diff --git a/README.org b/README.org
index e566d219665e69d5a744f60fa98d6789bd792bbb..2517594fdf57d31d4de03b0bddf540ec2e2342ed 100644
--- a/README.org
+++ b/README.org
@@ -1,6 +1,6 @@
* COMMENT -*- mode: org -*-
#+Date: 2016-12-16
-Time-stamp: <2016-12-16>
+Time-stamp: <2016-12-17>
* database binding benchmark
I want to know the efficiency of the db binding for different language,
@@ -39,3 +39,21 @@ https://www.postgresql.org/docs/9.4/static/libpq.html
26.2
//side note: why adding -shared in LDFLAGS will just segfault the program?
+** postgres 9.4, lts-7.13, ghc 8.0.1, postgresql-simple
+0.71
+27.5
+--
+0.63
+27.2
+--
+0.61
+26.2
+** postgres 9.4, lts-5.18, ghc 7.10.3, postgresql-simple
+0.61
+26.6
+--
+0.59
+26.8
+--
+0.63
+26.6
diff --git a/haskell-postgres-simple/Bench.hs b/haskell-postgres-simple/Bench.hs
new file mode 100644
index 0000000000000000000000000000000000000000..bfdb7f9eaf699e987caaeb7c80db8049aa1c48e2
--- /dev/null
+++ b/haskell-postgres-simple/Bench.hs
@@ -0,0 +1,32 @@
+module Main where
+
+import Control.Monad
+import Text.Printf
+import Data.Time.Clock
+import Database.PostgreSQL.Simple
+
+times :: Int
+times = 3000
+
+selectTest :: Connection -> IO ()
+selectTest conn = do
+ replicateM_ times (query_ conn "SELECT id, bar FROM foo" :: IO [(Int, Int)])
+
+updateTest :: Connection -> IO ()
+updateTest conn =
+ replicateM_ times $ execute_ conn "UPDATE foo SET bar=bar+1 WHERE id=1"
+
+timeit :: IO a -> IO a
+timeit action = do
+ start <- getCurrentTime
+ r <- action
+ end <- getCurrentTime
+ printf "seconds: %f\n" (realToFrac $ diffUTCTime end start :: Double)
+ return r
+
+main :: IO ()
+main = do
+ conn <- connectPostgreSQL "host=localhost dbname=t1 user=t1 password=fNfwREMqO69TB9YqE+/OzF5/k+s="
+ timeit $ selectTest conn
+ timeit $ updateTest conn
+ close conn
diff --git a/haskell-postgres-simple/LICENSE b/haskell-postgres-simple/LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..04f804e85a17df2a5861a8a063952f8c81a8b2aa
--- /dev/null
+++ b/haskell-postgres-simple/LICENSE
@@ -0,0 +1,30 @@
+Copyright Yuanle Song (c) 2016
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+
+ * Neither the name of Yuanle Song nor the names of other
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/haskell-postgres-simple/README.md b/haskell-postgres-simple/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..610f3d73a4fc9ebc2892785065f09eba198ed947
--- /dev/null
+++ b/haskell-postgres-simple/README.md
@@ -0,0 +1 @@
+test postgres-simple db binding
diff --git a/haskell-postgres-simple/Setup.hs b/haskell-postgres-simple/Setup.hs
new file mode 100644
index 0000000000000000000000000000000000000000..9a994af677b0dfd41b4e3b76b3e7e604003d64e1
--- /dev/null
+++ b/haskell-postgres-simple/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/haskell-postgres-simple/dbbench.cabal b/haskell-postgres-simple/dbbench.cabal
new file mode 100644
index 0000000000000000000000000000000000000000..f2ea231a16b9174d74776d2f6059027070de526e
--- /dev/null
+++ b/haskell-postgres-simple/dbbench.cabal
@@ -0,0 +1,27 @@
+name: dbbench
+version: 0.1.0.0
+synopsis: Initial project template from stack
+description: Please see README.md
+homepage: https://github.com/sylecn/dbbench#readme
+license: BSD3
+license-file: LICENSE
+author: Yuanle Song
+maintainer: sylecn@gmail.com
+copyright: Copyright: (c) 2016 Yuanle Song
+category: Utilities
+build-type: Simple
+extra-source-files: README.md
+cabal-version: >=1.10
+
+executable bench
+ main-is: Bench.hs
+ ghc-options: -threaded -rtsopts -with-rtsopts=-N
+ build-depends: base
+ , postgresql-simple
+ , time
+ default-language: Haskell2010
+ default-extensions: OverloadedStrings
+
+source-repository head
+ type: git
+ location: https://github.com/sylecn/dbbench
diff --git a/haskell-postgres-simple/stack.yaml b/haskell-postgres-simple/stack.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..ecf897a29ae14f0a135b4cc21bcf8eb627958fc9
--- /dev/null
+++ b/haskell-postgres-simple/stack.yaml
@@ -0,0 +1,66 @@
+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# http://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+# name: custom-snapshot
+# location: "./custom-snapshot.yaml"
+resolver: lts-5.18
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+# git: https://github.com/commercialhaskell/stack.git
+# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# extra-dep: true
+# subdirs:
+# - auto-update
+# - wai
+#
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- '.'
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.3"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor