Move LPOptimizer, DSL and tests to lp_optimizer/

mon/lp_optimizer/test-optimize-simple.js

@@ -0,0 +1,50 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+const { compat } = require('./simple_pgs.js');
+const LPOptimizer = require('./lp_optimizer.js');
+
+async function run()
+{
+    const osd_tree = {
+        100: { 1: 1 },
+        200: { 2: 1 },
+        300: { 3: 1 },
+    };
+
+    let res;
+
+    console.log('16 PGs, size=3');
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 3, pg_count: 16, ordered: false }));
+    LPOptimizer.print_change_stats(res, false);
+    assert(res.space == 3, 'Initial distribution');
+    console.log('\nChange size to 2');
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: false }));
+    LPOptimizer.print_change_stats(res, false);
+    assert(res.space >= 3*14/16 && res.osd_differs == 0, 'Redistribution');
+    console.log('\nRemove OSD 3');
+    const no3_tree = { ...osd_tree };
+    delete no3_tree['300'];
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree: no3_tree, pg_size: 2, ordered: false }));
+    LPOptimizer.print_change_stats(res, false);
+    assert(res.space == 2, 'Redistribution after OSD removal');
+
+    console.log('\n16 PGs, size=3, ordered');
+    res = await LPOptimizer.optimize_initial(compat({ osd_tree, pg_size: 3, pg_count: 16, ordered: true }));
+    LPOptimizer.print_change_stats(res, false);
+    assert(res.space == 3, 'Initial distribution');
+    console.log('\nChange size to 2, ordered');
+    res = await LPOptimizer.optimize_change(compat({ prev_pgs: res.int_pgs, osd_tree, pg_size: 2, ordered: true }));
+    LPOptimizer.print_change_stats(res, false);
+    assert(res.space >= 3*14/16 && res.osd_differs < 8, 'Redistribution');
+}
+
+function assert(cond, txt)
+{
+    if (!cond)
+    {
+        throw new Error((txt||'test')+' failed');
+    }
+}
+
+run().catch(console.error);