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[downloader] Improve reordering optimizations

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With some titles such as Metro Exodus there is
even more duplication across files. While this
change does not manage to reduce the limit to
below the default 1 GiB limit, it does bring
it down by about 512 MiB.
This commit is contained in:
derrod 2020-05-05 16:23:51 +02:00
parent 67859fb4ac
commit b1ba25e2e0
1 changed files with 18 additions and 10 deletions
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28
legendary/downloader/manager.py
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@ -189,7 +189,7 @@ class DLManager(Process):
if processing_optimization:
# reorder the file manifest list to group files that share many chunks
# 5 is mostly arbitrary but has shown in testing to be a good choice
min_overlap = 5
min_overlap = 4
# enumerate the file list to try and find a "partner" for
# each file that shares the most chunks with it.
partners = dict()
@ -197,13 +197,17 @@ class DLManager(Process):
for num, filename in enumerate(filenames[:int((len(filenames) + 1) / 2)]):
chunks = file_to_chunks[filename]
max_overlap = min_overlap
partnerlist = list()
for other_file in filenames[num + 1:]:
overlap = len(chunks & file_to_chunks[other_file])
if overlap > max_overlap:
partners[filename] = other_file
max_overlap = overlap
if overlap > min_overlap:
partnerlist.append(other_file)
if not partnerlist:
continue
partners[filename] = partnerlist
# iterate over all the files again and this time around
_fmlist = []
@ -214,13 +218,17 @@ class DLManager(Process):
_fmlist.append(fm)
processed.add(fm.filename)
# try to find the file's "partner"
partner = partners.get(fm.filename, None)
if not partner or partner in processed:
f_partners = partners.get(fm.filename, None)
if not f_partners:
continue
# add each partner to list at this point
for partner in f_partners:
if partner in processed:
continue
partner_fm = manifest.file_manifest_list.get_file_by_path(partner)
_fmlist.append(partner_fm)
processed.add(partner)
partner_fm = manifest.file_manifest_list.get_file_by_path(partner)
_fmlist.append(partner_fm)
processed.add(partner)
fmlist = _fmlist