DOS ain't dead

CHM reader in DOS (Announce)

posted by marcov, 01.04.2009, 23:39

> > (I should have mentioned that it does this too in 64-bit mode, where it
> > can allocate +/- 6GB, so it is not memory fragmentation or the like)
>
> Do you routinely use that much RAM (besides for maybe extra caching)??
>

Not currently. I had clusters of memory databases in a previous job though (several machines, 3GB each, and then a machine that would combine the subqueries from the data machines). At that time 64-bit was too difficult though, and big DIMMs were too expensive. Nowadays you would simply chuck 16GB in a Eur 499 64-bit machine and be done with it.

We had the luck that while we had to do queries in any direction (hence the memdatabase), there was a division in regions that was always used. So we splitted the dataset over such geographic divisions over several machines, and for statistics over all regions simply added up the numbers for the subqueries of the little machines. A lot of collegues had predicted doom and told us to use a "real" database, but this was lightning fast, and actually not that much work.

Currently my apps are typically 400-700MBish Some are bigger, but 1100MB working size is about max. If it is bigger, it is due to leaks. But some of them have 100MByte/s (2 GBit lines, though not entirely full) of image throughput, the queues of memory buffers for the cameras, and the image-queue that must be written to disk alone eat a lot.

> Don't forget that we used to have HDs smaller than that!!!

So? I have had 10MB HDs, but that never stopped me from using more than 10MB of ram either.

In one of my apps I have pictures of 4096x7000x8bpp which are 28MB each. I couldn't even fit that on such HD. (which actually wasn't my first. My first was 40MB, but later I got 10MB discs in a second machine. It was cheap because it was MFM and nobody wanted it anymore)

Complete thread:

• CHM reader in DOS - Laaca, 21.03.2009, 08:57 (Announce)
  • CHM reader in DOS - DOS386, 22.03.2009, 05:42
    • CHM reader in DOS - marcov, 23.03.2009, 17:22
      • CHM reader in DOS - DOS386, 31.03.2009, 03:47
  • CHM reader in DOS - marcov, 23.03.2009, 17:21
    • CHM reader in DOS - Laaca, 23.03.2009, 18:43
      • CHM reader in DOS - marcov, 23.03.2009, 21:30
        • CHM reader in DOS - marcov, 26.03.2009, 17:51
          • CHM reader in DOS - Rugxulo, 01.04.2009, 13:27
            • CHM reader in DOS - marcov, 01.04.2009, 23:39
              • CHM reader in DOS - Rugxulo, 02.04.2009, 00:16
                • CHM reader in DOS - marcov, 02.04.2009, 10:35
                  • big RAM / 64-bit / etc. - Rugxulo, 02.04.2009, 21:19
                    • big RAM / 64-bit / etc. - marcov, 04.04.2009, 15:13
                      • big RAM / 64-bit / etc. - Rugxulo, 04.04.2009, 17:21
                        • big problem ??? RAM / 64-bit / etc. - DOS386, 05.04.2009, 04:27
                          • big problem ??? RAM / 64-bit / etc. - marcov, 06.04.2009, 10:04
                            • big problem ??? RAM / 64-bit / etc. - DOS386, 07.04.2009, 04:32
                              • big problem ??? RAM / 64-bit / etc. - marcov, 07.04.2009, 13:24
                                • big problem ??? RAM / 64-bit / etc. - Rugxulo, 07.04.2009, 13:42
                        • big RAM / 64-bit / etc. - marcov, 06.04.2009, 09:53
                          • big RAM / 64-bit / etc. - Rugxulo, 07.04.2009, 00:43