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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<longdescription lang="en">
This is an experimental version of XPMEM based on a version provided by
Cray and uploaded to https://code.google.com/p/xpmem. This version supports
any kernel 3.12 and newer. Keep in mind there may be bugs and this version
may cause kernel panics, code crashes, eat your cat, etc.
XPMEM is a Linux kernel module that enables a process to map the
memory of another process into its virtual address space. Source code
can be obtained by cloning the Git repository, original Mercurial
repository or by downloading a tarball from the link above.
The XPMEM API has three main functions:
xpmem_make()
xpmem_get()
xpmem_attach()
A process calls xpmem_make() to export a region of its virtual address
space. Other processes can then attach to the region by calling
xpmem_get() and xpmem_attach(). After a memory region is attached, it
is accessed via direct loads and stores. This enables upper-level
protocols such as MPI and SHMEM to perform single-copy address-space
to address-space transfers, completely at user-level.
Note, there is a limitation to the usage of an attached region. Any
system call that will call get_user_pages() on the region from the
non-owning process with get EFAULT. This include pthread mutexes
and condition variable, and SYS V semaphores. We intend to address
this limitation in a future release.
XPMEM regions are free to have "holes" in them, meaning virtual memory
regions that are not allocated. This makes XPMEM somewhat more
flexible than mmap(). A process could, for example, export a region
via XPMEM starting at address 0 and extending 4 GB. Accesses to
allocated (valid) virtual addresses in this region proceed normally,
and pages are mapped between address spaces on demand. A segfault will
occur if the source process or any other process mapping the region
tries to access an unallocated (invalid) virtual address in the
region.
</longdescription>
<maintainer type="person">
<email>lssndrbarbieri@gmail.com</email>
<name>Alessandro Barbieri</name>
</maintainer>
<use>
<flag name="modules">Build the kernel module</flag>
</use>
<upstream>
<bugs-to>https://github.com/hjelmn/xpmem/issues</bugs-to>
<remote-id type="github">hjelmn/xpmem</remote-id>
</upstream>
</pkgmetadata>
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