[Rpm-maint] [rpm-software-management/rpm] Consider available memory and address space for parallel execution (PR #2418)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +    long int pagesize = sysconf(_SC_PAGESIZE);
+    long int pages = sysconf(_SC_PHYS_PAGES);
+
+    if (pagesize < 0)
+	pagesize = 4096;
+    if (pages > 0)
+	mem = pages * pagesize;
+
+    return mem;
+}
+
+static unsigned long getmem_proc(int thread)
+{
+    unsigned long mem = getmem_total();
+    /*
+     * Conservative estimates for thread use on 32bit systems where address

The total 32bit address space is 4GB. On a native 32bit Linux system, the kernel eats 1GB out of that, leaving 3GB for the process. On a 64bit system a 32bit process has nearly all of the 4GB available to it. While running out of physical memory can be handled by virtual memory (aka swap), the address space is a hard limit and rpm can't handle running into it. Which is why the estimates are very conservative.

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