Meeting held 2016-08-09 on FreeNode, channel #maemo-meeting (logs)

Attending: Win7Mac, eekkelund, juiceme, chem|st

Partial:

Absent: pichlo, reinob

Summary of topics (ordered by discussion):

• Topic Coding Competition

(Topic Coding Competition):

• Accepting donations: wiki page)
• Voting: wiki page). Every voter has one vote/category

• old items:
  • Coding competition planning (eekkelund)
  • Set up ftp/sftp site for CC (reinob)
  • Create twitter account for maemo community(eekkelund)
• new items:

• The next GA meeting should be announced soon.

Meeting held 2016-08-02 on FreeNode, channel #maemo-meeting (logs)

Attending: pichlo, Win7Mac, eekkelund, reinob, juiceme

Partial:

Absent:

Summary of topics (ordered by discussion):

• Topic warfare replaced all SSL certificates
• Topic MC e.V.

(Topic warfare replaced all SSL certificates):

• All maemo.org certs should be replaced now as the others were to expire today (except wiki)

(Topic MC e.V.):

• GA meeting invitation posted
• juiceme has papers for tax-excemption status. He will print those out

• old items:
  • Coding competition planning (eekkelund)
  • Set up ftp/sftp site for CC (reinob)
  • Create twitter account for maemo community(eekkelund)
• new items:

• The next GA meeting should be announced soon.

Meeting held 2016-07-26 on FreeNode, channel #maemo-meeting (logs)

Attending: pichlo, Win7Mac, eekkelund, reinob, juiceme

Partial: chem|st

Absent:

Summary of topics (ordered by discussion):

• Topic Approve pending request on https://garage.maemo.org/admin/approve-pending.php
• Topic Coding Competition
• Topic Twitter account
• Topic MC e.V.

(Topic Approve pending project request on https://garage.maemo.org/admin/approve-pending.php):

• juiceme added Council to garage admin group
• juiceme approved project request

(Topic Coding Competition):

• Postponed CC by one month
• Submitting an entry: "we could also set up an ftp site where we place whatever comes via mailing list, in case people prefer to download it like that" reinob could handle this

(Topic Twitter account):

• Maemo community does not have twitter account
• eekkelund will make one (Maemo Community, @maemo_org)

(Topic MC e.V.):

• Choocing GA meeting dates
• Court fillings
• Win7Mac&reinob will candidate for board

• old items:
  • Coding competition planning (eekkelund)
  • The next GA meeting should be announced soon.
• new items:
  • Set up ftp/sftp site for CC (reinob)
  • Create twitter account for maemo community(eekkelund)

Meeting held 2016-07-19 on FreeNode, channel #maemo-meeting (logs)

Attending: Win7Mac, eekkelund, reinob

Partial:

Absent: pichlo, juiceme

Summary of topics (ordered by discussion):

• Topic Coding Competition

(Topic Coding Competition):

• How to submit an entry? Thread to TMO/email
• Categories discussion, dropped wishlist.
• Updated the Wiki page

• old items:
  • Coding competition planning (eekkelund)
  • The next GA meeting should be announced soon.
• new items:

Meeting held 2016-07-12 on FreeNode, channel #maemo-meeting (logs)

Attending: eekkelund, pichlo, reinob

Partial:

Absent: Win7Mac, juiceme

Summary of topics (ordered by discussion):

• Topic Coding Competition

(Topic Coding Competition):

• Donations, board has PayPal and bank account
• Timeframe discussion
• Categories discussion, 3 main categories: Something new, Fixing/Updating and Beginner.
• Rules discussion
• eekkelund has edited wiki page

• old items:
  • Coding competition planning (eekkelund)
  • The next GA meeting should be announced soon.
• new items:

Meeting held 2016-07-05 on FreeNode, channel #maemo-meeting (logs)

Attending: juiceme, eekkelund, pichlo, Win7Mac, reinob

Partial:

Absent:

Summary of topics (ordered by discussion):

• Topic read-only option for TOR endpoints
• Topic Coding Competition

(Topic read-only option for TOR endpoints):

• There is thread in TMO
• maemo.org should have read-only option for tor endpoints
• Or if TMO is set up as hidden service then read-write access should be OK

(Topic Coding Competition):

• eekkelund will start to write wiki page
• Board will handle the prizes/donations
• Timeframe discussion
• Platforms discussion
• Categories discussion
• Voting, same as in elections

• old items:
  • The next GA meeting should be announced soon.
• new items:
  • Coding competition planning (eekkelund)

Currently one can choose between the following OGRE versions
1.9, 1.10, 2.0 and 2.1

As we all know does mmap, or even worse on Windows CreateFileMapping, need contiguous virtual address space for a given mapping size. That can become a problem when you want to load a file of a gigabyte with mmap.

The solution is of course to mmap the big file using multiple mappings. For example like adapting yesterday’s demo this way:

void FileModel::setFileName(const QString &fileName)
{
    ...
    if (m_file->open(QIODevice::ReadOnly)) {
        if (m_file->size() > MAX_MAP_SIZE) {
            m_mapSize = MAX_MAP_SIZE;
            m_file_maps.resize(1 + m_file->size() / MAX_MAP_SIZE, nullptr);
        } else {
            m_mapSize = static_cast(m_file->size());
            m_file_maps.resize(1, nullptr);
        }
        ...
    } else {
        m_index->open(QFile::ReadOnly);
        m_rowCount = m_index->size() / 4;
    }
    m_file_maps[0] = m_file->map(0, m_mapSize, QFileDevice::NoOptions);
    qDebug() map(mapIndex * m_mapSize, m_mapSize, QFileDevice::NoOptions);
    position = m_file_maps[mapIndex] + map_pos_i;
    if (position) {
            const int length = static_cast(end_i - pos_i);
            char *buffer = (char*) alloca(length+1);
            if (map_end_i >= map_pos_i)
                strncpy (buffer, (char*) position, length);
            else {
                const uchar *position2 = m_file_maps[mapIndex+1];
                if (position2 == nullptr) {
                    position2 = m_file_maps[mapIndex+1] = m_file->map((mapIndex+1) *
                         m_mapSize, m_mapSize, QFileDevice::NoOptions);
                }
                strncpy (buffer, (char*) position, MAX_MAP_SIZE - map_pos_i);
                strncpy (buffer + (MAX_MAP_SIZE - map_pos_i), (char*) position2, map_end_i);
            }
            buffer[length] = 0;
            ret = QVariant(QString(buffer));
        }
    }
    return ret;
}

You could also not use mmap for the very big source text file and use m_file.seek(map_pos_i) and m_file.read(buffer, length). The most important mapping is of course the index one, as the reading of the individual lines can also be done fast enough with normal read() calls (as long as you don’t have to do it for each and every line of the very big file and as long as you know in a O(1) way where the QAbstractListModel’s index.row()’s data is).

But you already knew that. Right?

Sometimes people want to do crazy stuff like loading a gigabyte sized plain text file into a Qt view that can handle QAbstractListModel. Like for example a QML ListView. You know, the kind of files you generate with this commando: