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4488047e
编写于
10月 21, 2015
作者:
E
Erik Rose
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Update the wheel-cache-disabling docs with our latest understanding of C compiler nondeterminism.
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docs/reference/pip_install.rst
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docs/reference/pip_install.rst
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4488047e
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@@ -516,10 +516,13 @@ those wheels would be selected for installation, but their hashes would not
...
@@ -516,10 +516,13 @@ those wheels would be selected for installation, but their hashes would not
match the sdist ones from the requirements file. A further complication is that
match the sdist ones from the requirements file. A further complication is that
locally built wheels are nondeterministic: contemporary modification times make
locally built wheels are nondeterministic: contemporary modification times make
their way into the archive, making hashes unpredictable across machines and
their way into the archive, making hashes unpredictable across machines and
cache flushes. However, wheels fetched from index servers land in pip'
s
HTTP
cache flushes. Compilation of C code adds further nondeterminism, as many
cache
,
not
its
wheel
cache
,
and
are
used
normally
in
hash
-
checking
mode
.
The
compilers include random-seeded values in their output. However, wheels fetched
only
potential
penalty
is
thus
extra
build
time
for
sdists
,
and
this
can
be
from index servers are the same every time. They land in pip'
s
HTTP
cache
,
not
solved
by
making
sure
pre
-
built
wheels
are
available
from
the
index
server
.
its
wheel
cache
,
and
are
used
normally
in
hash
-
checking
mode
.
The
only
downside
of
having
the
the
wheel
cache
disabled
is
thus
extra
build
time
for
sdists
,
and
this
can
be
solved
by
making
sure
pre
-
built
wheels
are
available
from
the
index
server
.
Hash
-
checking
mode
also
works
with
:
ref
:`
pip
download
`
and
:
ref
:`
pip
wheel
`.
A
Hash
-
checking
mode
also
works
with
:
ref
:`
pip
download
`
and
:
ref
:`
pip
wheel
`.
A
:
ref
:`
comparison
of
hash
-
checking
mode
with
other
repeatability
strategies
:
ref
:`
comparison
of
hash
-
checking
mode
with
other
repeatability
strategies
...
...
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