From tyearke@buffalo.edu Tue Nov 3 23:02:37 2020 Received: (at 1502) by bugs.x2go.org; 3 Nov 2020 22:02:46 +0000 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on ymir.das-netzwerkteam.de X-Spam-Level: X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00,HTML_MESSAGE, MIME_QP_LONG_LINE,SPF_HELO_NONE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.2 Received: from mtareserve25.acsu.buffalo.edu (mtareserve25.acsu.buffalo.edu [128.205.6.42]) by ymir.das-netzwerkteam.de (Postfix) with ESMTPS id A55485DAF2; Tue, 3 Nov 2020 23:02:33 +0100 (CET) Received: from appmailb.acsu.buffalo.edu (appmailb.acsu.buffalo.edu [128.205.4.58]) by mtareserve25.acsu.buffalo.edu (Postfix) with ESMTP id 4CQkKh2Y47zC69pD; Tue, 3 Nov 2020 17:02:32 -0500 (EST) Received: from appmailb.acsu.buffalo.edu (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 547531609FF7D; Tue, 3 Nov 2020 17:02:32 -0500 (EST) Received: from appmailb.acsu.buffalo.edu (localhost [127.0.0.1]) by appmailb.acsu.buffalo.edu (Postfix) with ESMTP id 0D4991609FF76; Tue, 3 Nov 2020 17:02:32 -0500 (EST) Received: from MBX-NR7.itorg.ad.buffalo.edu (mbx-nr7.acsu.buffalo.edu [128.205.7.210]) by appmailb.acsu.buffalo.edu (Prefixe) with ESMTP id 0A5531609FF75; Tue, 3 Nov 2020 17:02:32 -0500 (EST) Received: from mbx-nr8.itorg.ad.buffalo.edu (128.205.7.211) by MBX-NR7.itorg.ad.buffalo.edu (128.205.7.210) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 3 Nov 2020 17:02:30 -0500 Received: from mbx-nr8.itorg.ad.buffalo.edu ([192.168.1.108]) by MBX-NR8.itorg.ad.buffalo.edu ([192.168.1.108]) with mapi id 15.00.1497.006; Tue, 3 Nov 2020 17:02:30 -0500 From: "Yearke, Thomas" To: "uli42@gmx.de" , "1502@bugs.x2go.org" <1502@bugs.x2go.org> CC: "submit@bugs.x2go.org" Subject: Re: [X2Go-Dev] Bug#1502: macOS X2GoClient keyboard map updates crash specific server applications, spike server CPU usage Thread-Topic: [X2Go-Dev] Bug#1502: macOS X2GoClient keyboard map updates crash specific server applications, spike server CPU usage Thread-Index: AQHWsXo7w0l/NEzdA02/U0PSVaStS6m2RmqAgACwrIA= Date: Tue, 3 Nov 2020 22:02:30 +0000 Message-ID: <0BA097A7-B63A-4125-8853-8E1D4EFFDFD4@buffalo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.20.21.217] Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256; boundary="B_3687267749_1040077208" MIME-Version: 1.0 X-PM-EL-Spam-Prob: X: 11% --B_3687267749_1040077208 Content-type: multipart/alternative; boundary="B_3687267749_1167370133" --B_3687267749_1167370133 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable In both the current and patched versions of X2GoClient, changing the X11 ke= yboard map on the client side seems to have no immediate impact on an active= X2Go session. If a session is suspended, though, the session=E2=80=99s keyboard m= ap does get updated when it=E2=80=99s resumed by either version. =20 I believe this is the case because the client only constructs a keyboard ma= p during the first keyboard update in ONMainWindow::slotSetModMap. This map = is held in memory and reused by subsequent keyboard updates until it is dele= ted during a session suspension or termination. =20 (It=E2=80=99s worth noting that macOS uses an entirely-separate mechanism for man= aging the keyboard layout for non-X11 programs. Changing the keyboard layout= in System Preferences affects the Qt components of X2GoClient, but anything= X11-based is not affected by those changes. Only the X11 keyboard map as re= ported by xmodmap is used by local X11 apps and by X2GoClient=E2=80=99s keyboard m= ap builder.) =20 Tom =20 From: Ulrich Sibiller Reply-To: "uli42@gmx.de" Date: Tuesday, November 3, 2020 at 1:30 AM To: Tom Yearke , "1502@bugs.x2go.org" <1502@bugs.x2go.= org> Cc: "submit@bugs.x2go.org" Subject: Re: [X2Go-Dev] Bug#1502: macOS X2GoClient keyboard map updates cra= sh specific server applications, spike server CPU usage =20 Thanks for the patch. Keyboard on MacOS is special. As I do not have/know M= acOS I don't know why it was implemented that way. =20 =20 What happens if you change the MacOS keyboard while a session is running? =20 Uli =20 Yearke, Thomas schrieb am Di., 3. Nov. 2020, 01:45: Package: x2goclient Version: 4.1.2.2 Tag: patch When the macOS version of X2GoClient is connected to a server, it updates t= he session's keyboard map every 10 seconds. Depending on how other programs = running on the server respond to keyboard map changes, the repeated updates = can cause brief CPU usage spikes or (in the case of one of our applications)= they can cause freezes and crashes. The attached patch modifies the macOS client to only run the keyboard map u= pdate once on session startup. Testing done on my devices showed that this c= hange resolved the issue without introducing noticeable side effects. Howeve= r, I was not able to find the reason why the keyboard map is being updated r= egularly, so this may (re)introduce a problem I'm not aware of. Client OS: macOS 10.14.6 Client Software: X2GoClient 4.1.2.2 Server OS: CentOS 7.8 Server Desktop Environment: XFCE 4 Server x2goserver Version: 4.1.0.3 Server x2goserver-xsession Version: 4.1.0.3 Server nxagent Version: 3.5.99.24 Thank you for your consideration! Tom Yearke Software Engineer Science and Engineering Node Services University at Buffalo _______________________________________________ x2go-dev mailing list x2go-dev@lists.x2go.org https://lists.x2go.org/listinfo/x2go-dev --B_3687267749_1167370133 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

In both the current and patched versions of X2GoClient, chang= ing the X11 keyboard map on the client side seems to have no immediate impac= t on an active X2Go session. If a session is suspended, though, the session=E2= =80=99s keyboard map does get updated when it=E2=80=99s resumed by either version.

 

I believe this is the case because the client only constructs a keyboard= map during the first keyboard update in ONMainWindow::slotSetModMap. This m= ap is held in memory and reused by subsequent keyboard updates until it is d= eleted during a session suspension or termination.

 <= /p>

(It=E2=80=99s worth noti= ng that macOS uses an entirely-separate mechanism for managing the keyboard = layout for non-X11 programs. Changing the keyboard layout in System Preferen= ces affects the Qt components of X2GoClient, but anything X11-based is not a= ffected by those changes. Only the X11 keyboard map as reported by xmodmap i= s used by local X11 apps and by X2GoClient=E2=80=99s keyboard map builder.)

&= nbsp;

Tom

 

=

From:= Ulrich Sibiller <u= lrich.sibiller@gmail.com>
Reply-To: "uli42@gmx.de" &l= t;uli42@gmx.de>
Date: Tuesday, November 3, 2020 at 1:30 AM
<= b>To: Tom Yearke <tyearke@buffalo.edu>, "1502@bugs.x2go.org&q= uot; <1502@bugs.x2go.org>
Cc: "submit@bugs.x2go.org&quo= t; <submit@bugs.x2go.org>
Subject: Re: [X2Go-Dev] Bug#1502: = macOS X2GoClient keyboard map updates crash specific server applications, sp= ike server CPU usage

 

Thanks for the patch. Keyboar= d on MacOS is special. As I do not have/know MacOS I don't know why it was i= mplemented that way. 

 = ;

What happens if you change the MacO= S keyboard while a session is running?

 

Uli

=

 

Yearke, Thomas <tyearke@buffalo.edu> schrieb am Di., 3. Nov. 2020, 01:45:=

Package: x2goclient
Version: 4.1.2.2
Tag: patch

When the macO= S version of X2GoClient is connected to a server, it updates the session's k= eyboard map every 10 seconds. Depending on how other programs running on the= server respond to keyboard map changes, the repeated updates can cause brie= f CPU usage spikes or (in the case of one of our applications) they can caus= e freezes and crashes.

The attached patch modifies the macOS client t= o only run the keyboard map update once on session startup. Testing done on = my devices showed that this change resolved the issue without introducing no= ticeable side effects. However, I was not able to find the reason why the ke= yboard map is being updated regularly, so this may (re)introduce a problem I= 'm not aware of.

Client OS: macOS 10.14.6
Client Software: X2GoCli= ent 4.1.2.2
Server OS: CentOS 7.8
Server Desktop Environment: XFCE 4Server x2goserver Version: 4.1.0.3
Server x2goserver-xsession Version: = 4.1.0.3
Server nxagent Version: 3.5.99.24

Thank you for your consi= deration!

Tom Yearke
Software Engineer
Science and Engineering = Node Services
University at Buffalo


__________________________= _____________________
x2go-dev mailing list
x2go-dev@lists.x2go.org
https://lists.x2go.org/= listinfo/x2go-dev

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