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List: freedesktop-dbus
Subject: About performance of D-Bus
From: "Jerome Philbert" <jerome.philbert () gmail ! com>
Date: 2008-10-21 9:36:26
Message-ID: 9c0d19af0810210236t552d47d8tc6eb0aae5d85a6ac () mail ! gmail ! com
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Hi,
I've done some D-Bus benchmarks, as done here
http://lists.freedesktop.org/archives/dbus/2007-October/008829.html
I'm also interested in a quick D-Bus for an embedded solution based on
ARM9@200MHz.
I use dbus-1.2.3 and built it to be the quickest as below:
- without paranoid validation (mode =
DBUS_VALIDATION_MODE_WE_TRUST_THIS_DATA_ABSOLUTELY)
- with these options: ./configure --prefix=/usr --host=arm-linux
--with-xml=expat --without-x --disable-tests --disable-verbose-mode
--disable-asserts --disable-checks
I've written a simple test program where the client calls a synchronous
method (with D-Bus GLib bindings) with 3 integer input arguments and 3
integer output arguments. I measure the method call duration as described
below:
client side:
gettimeofday()
dbus_g_proxy_call (proxy, "MyMethod", error, G_TYPE_INT, IN_arg0,
G_TYPE_INT, IN_arg1, G_TYPE_INT, IN_arg2, G_TYPE_INVALID, G_TYPE_INT,
OUT_arg3, G_TYPE_INT, OUT_arg4, G_TYPE_INT, OUT_arg5, G_TYPE_INVALID)
server side:
gboolean test_object_my_method (TestObject *obj, gint a, gint b, gint c,
gint *r1, gint *r2, gint *r3, GError **error)
{
gettimeofday()
}
Result: the method call duration lasts about 4700us on ARM9@200MHz.
This number is an average of 1000 measures and is quite constant.
I have also measured with asynchronous method and I get same numbers.
Are these numbers normal ?
Why is D-Bus so slow ?
Is it possible to improve it ?
[Attachment #5 (text/html)]
Hi,<br><br>I've done some D-Bus benchmarks, as done here <a \
href="http://lists.freedesktop.org/archives/dbus/2007-October/008829.html">http://lists.freedesktop.org/archives/dbus/2007-October/008829.html</a><br>I'm \
also interested in a quick D-Bus for an embedded solution based on ARM9@200MHz.<br> <br>I use \
dbus-1.2.3 and built it to be the quickest as below:<br> - without paranoid validation \
(mode = DBUS_VALIDATION_MODE_WE_TRUST_THIS_DATA_ABSOLUTELY)<br> - with these options: \
./configure --prefix=/usr --host=arm-linux --with-xml=expat --without-x --disable-tests \
--disable-verbose-mode --disable-asserts --disable-checks<br> <br>I've written a simple \
test program where the client calls a synchronous method (with D-Bus GLib bindings) with 3 \
integer input arguments and 3 integer output arguments. I measure the method call duration as \
described below:<br> <br>client side:<br> gettimeofday()<br> dbus_g_proxy_call \
(proxy, "MyMethod", error, G_TYPE_INT, IN_arg0, G_TYPE_INT, IN_arg1, G_TYPE_INT, \
IN_arg2, G_TYPE_INVALID, G_TYPE_INT, OUT_arg3, G_TYPE_INT, OUT_arg4, G_TYPE_INT, OUT_arg5, \
G_TYPE_INVALID)<br> <br>server side:<br> gboolean test_object_my_method (TestObject *obj, \
gint a, gint b, gint c, gint *r1, gint *r2, gint *r3, GError **error)<br> \
{<br> gettimeofday()<br> }<br><br>Result: the method call duration \
lasts about 4700us on ARM9@200MHz.<br> This number is an average of 1000 measures and is quite \
constant.<br><br>I have also measured with asynchronous method and I get same \
numbers.<br><br>Are these numbers normal ?<br>Why is D-Bus so slow ?<br>Is it possible to \
improve it ?<br>
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